In each of the following sets of elements, indicate which element has the smallest atomic size.

msp;  a .  Na ,  K ,  Rb         c .  N ,  P ,  As b .  Na ,  Si ,  S           d .  N ,  O ,  F

(a)

Interpretation:

The element with smallest atomic size in the following set of elements is to be stated.

Concept Introduction:

The distance of the valence shell from the nucleus is known as Atomic size. On going down the group, the force of attraction between the nucleus and valence electrons in an atom decreases as the number of valence shells increases. This is the reason that atomic size increases. On going across the period, the force of attraction between the nucleus and valence electrons in an atom increases as the number of valence electrons in the same shell increases. This is the reason that atomic size decreases.

On going down the group, the force of attraction, between the nucleus and the valence electrons, decreases as the number of valence shells increases. Atomic size increases down the group because a completely new shell is added...

(b)

Interpretation:

The element with smallest atomic size in the following set of elements is to be stated.

Concept Introduction:

The distance of the valence shell from the nucleus is known as Atomic size. On going down the group, the force of attraction between the nucleus and valence electrons in an atom decreases as the number of valence shells increases. This is the reason that atomic size increases. On going across the period, the force of attraction between the nucleus and valence electrons in an atom increases as the number of valence electrons in the same shell increases. This is the reason that atomic size decreases.

(c)

Interpretation:

The element with smallest atomic size in the following set of elements is to be stated.

Concept Introduction:

The distance of the valence shell from the nucleus is known as Atomic size. On going down the group, the force of attraction between the nucleus and valence electrons in an atom decreases as the number of valence shells increases. This is the reason that atomic size increases. On going across the period, the force of attraction between the nucleus and valence electrons in an atom increases as the number of valence electrons in the same shell increases. This is the reason that atomic size decreases.

(d)

Interpretation:

The element with smallest atomic size in the following set of elements is to be stated.

Concept Introduction:

The distance of the valence shell from the nucleus is known as Atomic size. On going down the group, the force of attraction between the nucleus and valence electrons in an atom decreases as the number of valence shells increases. This is the reason that atomic size increases. On going across the period, the force of attraction between the nucleus and valence electrons in an atom increases as the number of valence electrons in the same shell increases. This is the reason that atomic size decreases.