what is a period science

What is period in chemistry?

Periods are horizontal rows in the periodic table. For each period, all the elements in it have the same number of electron shells. Groups are the vertical columns in the periodic table. Elements in a group have similar chemical properties as they have the same number of outermost shell electrons.

What is a phase in science term?

phase, in thermodynamics, chemically and physically uniform or homogeneous quantity of matter that can be separated mechanically from a nonhomogeneous mixture and that may consist of a single substance or a mixture of substances. The three fundamental phases of matter are solid, liquid, and gas (vapour), but others are considered to exist, including crystalline, colloid, glassy, amorphous, and ...

What is the definition of period in physics?

What is a period physics? A period T is the time required for one complete cycle of vibration to pass a given point. As the frequency of a wave increases, the period of the wave decreases. Frequency and Period are in reciprocal relationships and can be expressed mathematically as: Period equals the Total time divided by the Number of cycles.

What is the period measured in?

the period (T) is measured in seconds (s) frequency (f) is measured in hertz (Hz) Example. Calculate the time period of a wave with a frequency of 50 Hz. [T = frac{1}{f}] [T = 1 div 50] [T...

What is a period in science?

A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements.

What is a period in science for kids?

Each horizontal row in the table is a period. There are seven (or eight) total periods.

What is a period answer?

Simply put: A period is when a woman's body releases tissue it no longer needs. This tissue comes from the uterus, which is where a baby (fetus) can develop in the female body. Every month or so, the uterus lining gets thicker to prepare for a fertilized egg if the woman becomes pregnant.

What is period and group in periodic table?

The vertical columns in the periodic table are called 'groups' and horizontal rows in the table are called periods.

What is a period in simple terms?

Summary. Menstruation, or period, is normal vaginal bleeding that occurs as part of a woman's monthly cycle. Every month, your body prepares for pregnancy. If no pregnancy occurs, the uterus, or womb, sheds its lining. The menstrual blood is partly blood and partly tissue from inside the uterus.

Do boys have cramps?

Men experience similar symptoms to women when they go through hormonal imbalances. Many of them are similar to the female menstrual cycle including tiredness, cramps, increase sensitivity and cravings. According to one study, around 26 % of men experience these regular “man periods.”

What is period in a number?

When a number is written in standard form, each group of digits separated by a comma is called a period . The number 5,913,603,800 has four periods.

How do you know the period of an element?

If you are given with the atomic number of an element you can find it's period number and group number. The period number is related to the number of electron occupied shells in the element and the period number is linked to its valence electrons.

Can a woman get pregnant on her period webmd?

You can get pregnant during your period. You're at your peak fertility when you ovulate. So if you have sex during this time, it could actually make you more likely to get pregnant. Second, you may ovulate before your period is over or within a few days after the bleeding stops.

What is difference between group and period?

Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.

How do you remember periods and groups?

0:292:53Periods & Groups In The Periodic Table | Properties of Matter - YouTubeYouTubeStart of suggested clipEnd of suggested clipEach new period row represents a new shell elements in the first period have one shell and as we goMoreEach new period row represents a new shell elements in the first period have one shell and as we go down the shells.

How many periods are there?

"Girls can start their periods anywhere from age 10 upwards, but the average is around 12 years," says Belfield. "The average age for the menopause (when periods stop) in this country is 50 to 55." Between the ages of 12 and 52, a woman will have around 480 periods, or fewer if she has any pregnancies.

Can a 9 year old get her period?

Most girls start their periods when they're about 12, but they can start as early as 8, so it's important to talk to girls from an early age to make sure they're prepared. Respond to questions or opportunities as they arise and do not be embarrassed. Periods are natural.

How do you talk to your children about periods?

Talk early and often The earlier you begin talking to your child about the changes to expect during puberty, the better. Don't plan a single tell-all discussion. Instead, plan on a series of conversations. If your child asks questions about menstruation, answer them openly and honestly.

How do you explain a period to a child video?

0:173:19Menstruation: What To Expect - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd for some people even older. Everyone goes through puberty at the time that's right for theirMoreAnd for some people even older. Everyone goes through puberty at the time that's right for their body. Once a person reaches puberty those with the uterus prepare for the possibility of eventually.

How does a girl get her first period?

The first period typically occurs after a female first ovulates. This happens when the ovaries release an egg into the fallopian tube. When this happens, the womb lining thickens in preparation for the egg to be fertilized. If fertilization does not occur, the lining sheds, as the body no longer needs it.

Why are there more elements in a period?

In other words, each atom has the same number of electron shells. As you more down the periodic table, there are more elements per element period because the number of electrons allowed per energy sublevel increases.

How do periodic groups and periods organize the elements of the periodic table?

Element groups and periods organize the elements of the periodic table according to periodic law. This structure categorizes elements according to their similar chemical and physical properties. As you move across a period, an atom of each element gains an electron and displays less metallic character than the element before it. So, elements within a period on the left side of the table are highly reactive and metallic, while elements on the right side are highly reactive and nonmetallic until you reach the final group. The halogens are nonmetallic and not reactive.

What is the term for the horizontal row of the periodic table?

in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. In chemistry, the term period refers to a horizontal row of the periodic table. Elements in the same period all have the same highest unexcited electron energy level ...

Which side of the periodic table is highly reactive?

So, elements within a period on the left side of the table are highly reactive and metallic, while elements on the right side are highly reactive and nonmetallic until you reach the final group. The halogens are nonmetallic and not reactive.

Is period 8 radioactive?

All elements in period 7 are radioactive. Period 8 consists solely of yet-to-be-discovered synthetic elements. Period 8 is not found on the typical periodic table, but does show up on extended periodic tables.

What is the axis of a transverse wave called?

transverse waves. …the axis is called the period of the wave motion, and the number of oscillations executed per second is called the frequency. Wavelength is considered to be the distance between corresponding points on the wave— i.e., the distance between two adjacent peaks or troughs of the wave.

How long is a pendulum with a period of one second?

The length of a pendulum with a period of one second is about 39 inches (990 mm), and an increase in length of 0.001 inch (0.025…

How to find period of a pendulum?

…each complete oscillation, called the period, is constant. The formula for the period T of a pendulum is T = 2π Square root of√L/g , where L is the length of the pendulum and g is the acceleration due to gravity.

What is real wave?

Real waves, however, always have a more irregular appearance. They may be described as composite waves, in which a whole spectrum of wavelengths, or periods, is present and which have more or less diverging directions of propagation. In reporting….

What is vibration in physics?

…vibrations, the fraction of a period ( i.e., the time required to complete a full cycle) that a point completes after last passing through the reference, or zero, position. For example, the reference position for the hands of a clock is at the numeral 12, and the minute hand has a…

Which type of wave travels faster, long or short?

Longer waves travel faster than shorter ones, a phenomenon known as dispersion. If the water depth is less than one-twentieth of the wavelength, the waves are known as long gravity waves, and their wavelength is directly…. …one wavelength and one wave period and propagating in one direction.

Is period independent of amplitude?

According to this analysis, the period, T, is independent of the amplitude of the oscillation, and this rather unexpected prediction is one that may be stringently tested. Instead of letting the ball roll on a curved channel, the same path is more easily and exactly realized by making it the…

When is a period normal?

Takeaway. A period (menstruation) is normal vaginal bleeding that is a natural part of a healthy monthly cycle for a person with a uterus and ovaries. Every month, in the years between puberty (typically age 11 to 14) and menopause (typically about age 51), your body readies itself for pregnancy.

How long does it take to bleed during your period?

Trusted Source. during their period. The time between periods (last day to first day) typically averages 28 days, with bleeding typically lasting around 4 to 5 days. However, people can experience longer time between periods, and fewer or more days of bleeding, and still have totally “regular” periods.

How much blood does a woman lose during her period?

The average person who menstruates loses about 2 to 3 tablespoons of blood. Trusted Source. during their period.

How long does it take for birth control to stop your cycle?

Birth control pills. If you take daily birth control pills, after a year you’ll have about a 70 percent chance of suppressing your cycle.

Can my period be stopped?

No method guarantees no periods, but, according to a 2014 article in the International Journal of Women’s Health, you can suppress your cycle with various types of birth control such as:

How many periods are there in the periodic table?

Elements within a period display periodic table trends, moving from left to right, involving atomic and ionic radius, electronegativity, There are seven element periods. Some periods contain more elements than others because the number of included elements depends on the number of electrons allowed in an energy sublevel.

What is the difference between periodic table groups and periods?

Periodic Table Groups and Periods. A periodic table group is a column, while a periodic table period is a row. Groups and periods organize elements on the periodic table of the elements. A group is a vertical column down the periodic table, while a period is a horizontal row across the table. Both groups and periods reflect the organization ...

What are the elements that chemists classify?

These groups go by the names alkali metals, alkaline earth metals, transition metals, basic metals, nonmetals, halogens, noble gases, lanthanides, and actinides.

How does the atomic number of an element increase?

Element atomic number increases as you move down a group from top to bottom or across a period from left to right. An element group is a vertical column on the periodic table. Atoms in a group share the same number of valence electrons. An element period is a horizontal row on the periodic table. Atoms in a period have the same number ...

When do you stop getting your period?

Most people stop getting their period when they’re between 45 and 55 years old — this is called menopause. Menopause can take a few years, and periods usually change gradually during this time. After menopause is totally complete, you can’t get pregnant anymore. Read more about menopause.

How often does a woman have her period?

Menstruation — aka having your period — is when blood and tissue from your uterus comes out of your vagina. It usually happens every month.

When can I get pregnant during my menstrual cycle?

You have the highest chance of getting pregnant on the days leading up to ovulation (when your ovary releases a mature egg) — these are called fertile days.

What is it called when you ovulate?

About halfway through your menstrual cycle, your hormones tell one of your ovaries to release a mature egg — this is called ovulation . Most people don’t feel it when they ovulate, but some ovulation symptoms are bloating, spotting, or a little pain in your lower belly that you may only feel on one side.

What hormones are involved in the menstrual cycle?

It also makes you have a period if you’re not pregnant. Your menstrual cycle is controlled by hormones like estrogen and progesterone. The 1st day of your menstrual cycle starts on the 1st day of your period (AKA menstruation).

How long does sperm live in the uterus?

Your egg lives for about 1 day after it’s released from your ovary, and sperm can live in your uterus and fallopian tubes for about 6 days after sex. So you can usually get pregnant for around 6 days of every menstrual cycle: the 5 days before you ovulate, and the day you ovulate.

Why do people track their menstrual cycle?

Many people track their menstrual cycles and other fertility signs to help them figure out when they’re ovulating. This is called fertility awareness — some people use it to prevent pregnancy, and others use it to try to get pregnant. Check out our app, which makes it easy to chart your cycle and figure out your fertile days.

What Is A Wave Period?

Have you ever tried surfing? In order to surf, we need waves. However, a surfer doesn't want to ride just any wave. Surfers want to catch waves that are nice and big or which have a high amplitude. Also, it won't be any fun if a wave appears and disappears quickly. Surfers like waves that last long, or those with a long wavelength and wave period.

How do waves have different periods?

Different waves have different frequencies and periods. The wave period is the time it takes to complete one cycle. The standard unit of a wave period is in seconds, and it is inversely proportional to the frequency of a wave, which is the number of cycles of waves that occur in one second.

What happens to the period of a wave if the frequency is large?

In other words if the frequency is large, then the period is short and if the frequency is small, then the period is long. Remember that wavelength and velocity both affect the frequency, so we can also say, the higher the wavelength, the higher the wave period and the lower the velocity, the higher the wave period.'.

How many cycles per second does a wave have?

Let's say we determine a wave moves at 60 Hertz; that wave will have 60 cycles per second. When writing formulas, Hertz is usually abbreviated to Hz.

Which color has a higher wave period?

Violet's reciprocal and, therefore, its wave period is 1.25x10^-15 seconds. These are complicated numbers but we can still answer the second question: which color has a higher wave period? In this case, the answer is red, whose wave cycle is just a bit slower. We can also figure this out given the frequencies of the two waves. Remember that frequency is inversely proportional to wave period. That means the higher the frequency of a wave, the smaller its wave period will be.

How to find frequency?

Frequency ( f ), can be obtained by dividing the wave's velocity , usually symbolized by the letter v, by its wavelength. Remember, we represent it with the Greek symbol: lambda. We usually measure the wavelength in meters and the velocity in meters per second. The frequency found using these units will be measured in Hz (hertz), another way of saying cycles per second.

Is the wave period dependent on the wavelength?

The wave period is also dependent on the wavelength and the velocity. The higher the velocity, the lower the wave period, and the higher the wavelength, the higher the wave period. To unlock this lesson you must be a Study.com Member.