What happens to the atomic size of elements moving from top to bottom of a group?

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Solution

Atomic size is the distance between the center of the nucleus of an atom and its outermost shell.
Atomic size increases as we move from top to bottom of a group because as we move down a new shell gets added and electrons in the outermost shell so the distance from the nucleus increases.

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Q. Atomic number is considered to be a more appropriate parameter than atomic mass for the classification of elements in a periodic table. Why?
How does atomic size of elements vary on moving from:
(i) left to right in a period?
(ii) top to bottom in a group?
Give reasons for your answers.

(a) What are the periods and groups in a periodic table? Give two characteristics of each.

(b) In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group.

$\begin{matrix} L i & B e N a K R b C s F r & R a \end{matrix}$

(i) What happens to the size of atoms?

(ii) What happens to their metallic character?

(d) Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?

(e) Rewrite the following statement after correction, if necessary :

Groups have elements with consecutive atomic numbers.

Q. On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?

(a) increases
(b) decreases
(c) remain the same
(d) first increases then decreases

Q. (a) What are the periods and groups in a periodic table? Give two characteristics of each.
(b) In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group.
(c) Given alongside is a part of the periodic table. As we move vertically downward from Li to Fr:

Li	Be
Na
K
Rb
Cs
Fr	Ra

(i) What happens to the size of atoms?
(ii) What happens to their metallic character?
(d) Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?
(e) Rewrite the following statement after correction, if necessary:
Groups have elements with consecutive atomic numbers.

What happens to the atomic size of elements on moving from top to bottom of a group?

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What happens to the atomic size of elements moving from top to bottom of a group?

Atomic size is the distance between the center of the nucleus of an atom and its outermost shell.Atomic size increases as we move from top to bottom of a group because as we move down a new shell gets added and electrons in the outermost shell so the distance from the nucleus increases.

Atomic size is the distance between the center of the nucleus of an atom and its outermost shell.
Atomic size increases as we move from top to bottom of a group because as we move down a new shell gets added and electrons in the outermost shell so the distance from the nucleus increases.