Question

Which is not correct with reference to the elements of group 18?

(a) Zero electron affinity

(b) Maximum ionisation energy

(c) Complete octet

(d) Valency is variable​

Answer 1

Answer:

d is the correct answer

Explanation:

Answer 2

(d) Valency is variable is not correct with reference to the elements of group 18

• Members of the elements group 18 are known for their stability. It is because of this stable electronic configuration they have zero electron affinity. Hence, (a) is correct.
• Group 18 element posses the maximum ionisation energy too as they have a stable octet structure. This is also related to their atomic size. Hence, option (b) is correct too.
• Group 18 elements have all electrons filled in their respective orbit. Hence, they have a complete octet. So, (c) is correct.
• The valency of group 18 elements is zero. It is because of complete octet of these noble gas they have zero valency. Hence, option (d) Valency is variable isn't correct.