Question

All of the following are isoelectronic with Ca2+ except

A. P^3-.

B. Mg^1+.

C. K^1+.

D. S^2–.

E. Cl^1–

Answer 1

Can anybody explain?

Answer 2

you should know the defination of isoelectronic first :)

Answer 3

isoelectronic : noting or pertaining to atoms and ions having an equal number of electrons.

Answer 4

Would A be the answer?

Answer 5

its b Mg+1.....

Answer 6

Look, all other options including Ca+2 have 18 electrons. Mg+1 has 11 electrons

Answer 7

wow!! Thanks a lot!!!

Answer 8

oppss..sorry @RH :3 hehhe..its my fault -_-' too careless..OMG..always :3