Aluminum Has Atomic Number 13, Helium Has Atomic Number 2 $\rightarrow$

Multiple Choice

Aluminum has atomic number 13, helium has atomic number 2, and silicon has atomic number 14.In the nuclear reaction ²⁷Al + ⁴He $\rightarrow$ ³⁰Si + ( ) the missing particle is:

A) an $\alpha$ particle
B) a positron
C) an electron
D) a proton
E) a neutron