What is the Maximum Number of Electrons in the ﬁRst

Question

What is the maximum number of electrons in the ﬁrst energy shell of an atom?
A) 2
B) 4
C) 8
D) 18
E) 32

Accepted Answer

The first energy shell of an atom can hold a maximum of 2 electrons, according to the 2n^2 rule, where n is the principal quantum number (n=1 for the first shell).