Why is the periodic table useful?
One of the reasons the periodic table is so useful is because its structure allows us to qualitatively determine how some properties of the elements vary versus their position on the periodic table. The variation of properties versus position on the periodic table is called periodic trends. There is no other tool in science that allows us to judge relative properties of a class of objects like this, which makes the periodic table a very useful tool. Many periodic trends are general. There may be a few points where an opposite trend is seen, but there is an overall trend when considered across a whole row or down a whole column of the periodic table.
What happens when you go from left to right on the periodic table?
These protons serve to pull the electrons closer to the nucleus. Thus, we expect that as you go from left to right along each period, ATOMIC SIZE DECREASES.
Why is IE always positive?
IE is usually expressed in kJ/mol of atoms. It is always positive because the removal of an electron always requires that energy be put in (i.e., it is endothermic). IE also shows periodic trends. As you go down the periodic table, it becomes easier to remove an electron from an atom (i.e., IE decreases) because the valence electron is farther away from the nucleus. However, as you go across the periodic table and the electrons get drawn closer in, it takes more energy to remove an electron; as a result, IE increases.
What properties can be qualitatively understood by the positions of the elements on the periodic table?
Certain properties—notably effective atomic radius, IE, and EA —can be qualitatively understood by the positions of the elements on the periodic table.
What happens to the valence electron configuration as you go down a group?
As you go down a group, the valence electron configuration stays the same, but the number of shells is increasing. Each shell represents distance from the nucleus (as well as energy), thus we expect that ATOMIC SIZE INCREASES as you go down a row on the periodic table.
Why do elements show periodicity?
In modern periodic table elements have been arranged according to their atomic numbers and as stated above atomic numbers are directly related to their physical and chemical properties. That’s why elements show periodicity in their physical and chemical properties in the periodic table. For example, as we move from left to right in a period, ...
What is modern periodic law?
Modern periodic law is the base of periodic trends of properties of elements in the modern periodic table. Following properties of elements show a very clear periodic trends in periodic table –
How does reactivity of metals depend on its electropositive character?
Reactivity of metals depends on its electropositive character. So, more is the metallic character , more is the electropositive nature of the element and more is its reactivity. As metallic character decreases across a period left to right, so reactivity also decreases. Although reactivity of nonmetals increases on moving left to right across a period. Thus, we can conclude, as we move left to right in a period, the reactivity of elements gradually decreases up to the group thirteen and then starts increasing.
What happens when you move left to right across a period in the periodic table?
Across a Period – on moving left to right across a period in the periodic table, first valency increases then decreases.
Why do atomic radii increase in intergases?
The reason for this type of exceptional behavior is that atomic radius refers to van der Waal’s radius in case of noble gases while in case of other elements it refers to covalent radius.
Which elements are present in the 1st group?
For example, hydrogen, lithium, and sodium elements are present in the 1st group and have the same number of valence electrons which is one.
Do melting points of nonmetals increase or decrease?
Melting and boiling points of metals decrease gradually from top to bottom in a group. While melting and boiling points of nonmetals increase on moving from top to bottom in a group of the periodic table. This ends our coverage on the topic “Trends of Periodic Properties in the Periodic Table”.
Why is the periodic table important?
To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference.
Why is the periodic table used?
Before all naturally occurring elements were discovered, the periodic table was used to predict the chemical and physical properties of elements in the gaps on the table. Today, the table can be used to predict properties of elements yet to be discovered, although these new elements are all highly radioactive and break down into more familiar ...
How is the periodic table organized?
The periodic table is organized according to trends in element properties. As you move from left to right across a row of elements, the atomic radius (the size of an element's atoms) decreases, ionization energy (the energy required to remove an electron from an atom) increases, electron affinity ...
What are the properties of the periodic table?
Properties of metals include metallic luster, high electrical and thermal conductivity, ductility, malleability, and several other traits. The right-hand side of the periodic table contains the nonmetals, which do not display these properties.
How do atoms become larger?
As you move down the periodic table, elements have more protons and gain an electron energy shell, so atoms become larger. As you move across a row of the periodic table, there are more protons and electrons, but the electrons are held more closely to the nucleus, so the overall size of the atom decreases.
Which side of the periodic table contains nonmetals?
The right-hand side of the periodic table contains the nonmetals, which do not display these properties. As with the other properties, metallic character relates to the configuration of valence electrons.
