Which of the following ions has an electron configuration different from the other?

johnogbec

8 years ago

Here is an explanation:

17Cl configuration is:2,8,7.8O2-=8+2=10,12Mg2+=12-2=10=2,8.13Al3+=13-3=10=2,8.only option A has a different electronical configuration.check new school chemistry textbook

Ericjulius

6 years ago

Cl-=18e-(2,8,8) O2-=10e-(2,8) Mg2+=10e-(2,8) Al3+=10e-(2,8) so the answer is (A)

dosmay

10 years ago

explaination please?

Prince Nemerem

9 years ago

The answer should be B - Oxygen because it possess only 2 shell, unlike the others that possess 3