A particular nucleus of the element erbium contains 68 protons and 90 neutrons.What is the total number of electrons in the neutral erbium atom?
A)90
B)158
C)22
D)68
E)None of the above

Question

Quizplus · Accepted Answer

The number of electrons in a neutral atom is equal to the number of protons, which in this case is 68. The number of neutrons is not relevant to determining the number of electrons.

A Particular Nucleus of the Element Erbium Contains 68 Protons