A Particular Nucleus of the Element Erbium Contains 68 Protons $\times$

Multiple Choice

A particular nucleus of the element erbium contains 68 protons and 90 neutrons.What is the total charge of the erbium nucleus?

A) zero
B) 1.4 $\times$ 10^-17 C
C) 2.5 $\times$ 10^-17 C
D) 1.1 $\times$ 10^-17 C
E) 3.5 $\times$ 10^-18 C