The Atomic Weight of Chlorine Is Very Close to 35

Multiple Choice

The atomic weight of chlorine is very close to 35.5.This means that:

A) chlorine occurs with a variable number of protons
B) a variable number of electrons gives the fractional weight
C) on the average,an atom of chlorine weighs almost 3 times as much as carbon
D) the actual weight of a chlorine atom is not known very precisely
E) chlorine atoms contain half of a proton