One Pg (Picogram) of ⁴⁰K Has How Many Nuclei?
A) $\times$

One pg (picogram) of ⁴⁰K has how many nuclei?

A) 6.0 $\times$ 10¹⁷
B) 6.0 $\times$ 10¹¹
C) 1.5 $\times$ 10²²
D) 3.0 $\times$ 10¹¹
E) 1.5 $\times$ 10¹⁰