Question

OFFERING 99 POINTS AND BRAINLIEST TO BEST ANSWER!!!

Answer 1

The x number in ^x indicates the number of electronics in an obit, e.g. 1s^2 means there are 2 electrons in the 1s orbit.

Total number of electrons in A = 2 + 2 + 6 +2 + 6 + 2 + 2

= 22

VALENCE electrons are those in the outer most shell.

In A, there are 4s^2 + 4p^2: 2 + 2 = 4

Answer should be C instead. So sorry for the mistake earlier!

Answer 2

Example A: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^2

counting e-:    2       2        6      2       6       2      2

2+2+6+2+6+2+2 = 22

ans is A. 22