How many total atoms are in the following: 3NHe4
A.15
B.3
C.7
D.12

I think the answer is 12..

there are no correct statementd on the list of choices you provided.

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.