Question

Q 35/90 Which of the following species has radius
less than ionic radius of K+?
S-2
K
Mg+2
CI-​

Answer 1

Mg2+ has less radius than K+

Explanation:

Positively-charged protons in the nuclei attract the negatively-charged electron cloud. Each proton carries a +1 charge the more protons an atom or ion contains the stronger the attraction it poses on its electron cloud. A nucleus of strong positive charge pulls its electron cloud towards itself tightly such that the latter would have a small radius.As you know Mg contains more number of positive charge.

Answer 2

Answer:

mg ＋2

because when cation loss electrons its size decreases