Question

for each of the following pairs indicate which of the two species of large size a. Fe2+ orFe3+ b. Mg2+ or Ca2+​

Answer 1

Answer:

a) Fe2+

b) Ca2+

Explanation:

a) Fe has total 26 electrons, therefore Fe2+ will have 24 and Fe3+ will have total 23 electron or 4 electrons in Fe2+ or 3 electrons in Fe3+ which means less nucleus attraction in Fe2+ so it will have larger size.

b)Magnesium and Calcium atomic nos are 12 and 20 respectively.

Mg2+ has total 10 electrons and Ca2+ has total 18 electrons.

So, Ca2+ will have more no of subshell which means greater particle size.

Hope it might help!

Answer 2

Answer:

a) Fe 2+ is bigger.

b) Ca2+ is bigger.

Explanation:

a) For isoelectronic , less charge more size.

b) moving down the group size increases