Question

of the most common ions of the third period elements mg, al, p, and s which is the largest. (answer is P??)

Answer 1

the most common ions of the given elements are

Mg+2 , Al+3 , P-3 , S-2

now

both Mg and Al will shrink because electrons are being removed from them

P and S will increase because their size because electrons are being added to them

now

of P and S

P is to the left of S in the periodic table

we know that

across the table , from left to right for a normal element, size decreases

also 3 electrons are being added to P

so

the largest size will be that of ion formed by P

Answer --> P