Question

What is the total number of valence electrons in an atom with the electron configuration 2-8-1 ?

A) 1
B) 2
C) 8
D) 11

Answer 1

Answer: A)1

Step-by-step explanation:

Valence electrons are always in Thebes last shell and last number of the configuration.

Answer 2

1 because the last one is 1 and the previous shell was complete.