Question

The following are some statements about periodic properties.
i) Atomic size decreases from left to right in a period.
ii) The EA of $2^{nd}$ group elements in VA, VIA and VIIA are greater than the first element.
iii) Acidic nature of oxides decreases and basic nature of oxides of elements increased down the group.
iv) Atomic size increases from left to right in a period.

• A. only (i) and (iii) correct
• B. only (ii) correct
• C. only (iii) and (iv) are correct
• D. only (iv) is correct

Answer 1

The correct option is A only (i) and (iii) correct

Atomic size decreases from left to right due to an increase in effective nuclear charge as the incoming electron enters into the same subshell, hence 1st statement is correct

Generally, EA of the second element is less than the first element because as we move from top to bottom in a group the atomic size increases and nuclear charge increases hence it releases less energy and consumes more energy while adding an electron to it. Hence 2nd statement is wrong

Generally in a group, basic nature increases acidic nature decreases so 3rd statement is correct

The atomic size will be decreased from left to right it will not be increased so 4th statement is wrong

So the correct statements are 1 and 3