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A, B, C are three elements in which B is an inert gas other than helium. With this information complete the following table.
Element

Atomic
number
No. of electrons
in the valence
shell
Group to which
the element
belongs
A
B
C
Z − 1
Z
Z + 1
....
....
....
....
....
....
Also, explain the following:
(i) Electron affinity of element A is more than that of element C.
(ii) Ionization energy of element C is less than that of element A.
(iii) Electron affinity of B is zero.

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Solution

Element

Atomic
number

No. of electrons
in the valence
shell
Group to which
the element
belongs
A
B
C
Z − 1
Z
Z + 1
7
8
1
17
18
1

(i) Electron affinity of elements increases with increase in atomic number and decrease in atomic size. As the size decreases, force of attraction between nucleus and incoming electron increases and hence, the electron affinity increases. Element C contains one extra shell than element A; therefore, element A is smaller in size. Hence, the electron affinity of element A is more than that of element C.

(ii) Ionisation energy of element C is less than that of element A because element C needs to lose only one valence electron to obtain stable noble gas configuration. The energy required to remove one electron from the valance shell of element C is much lesser than the energy required to remove seven electrons from the valence shell of element A.

(iii) Electron affinity of element B is zero because it has a completely filled valence shell; hence, addition of electrons will not take place in element B.

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