The first shell in the ground state of a krypton atom can contain a maximum of ________ electrons.
A)6
B)36
C)8
D)18
E)2

Question

Quizplus · Accepted Answer

According to the Aufbau principle and the periodic table, the first shell or energy level can hold a maximum of 2 electrons. Krypton, being a noble gas, has a full first shell with 2 electrons in it in its ground state, so it cannot hold any more electrons in that shell.

The First Shell in the Ground State of a Krypton