Consider the isotope
Br.The atomic number is ________,and the mass number is ________.
A)79;35
B)35;79
C)44;35
D)35;44
E)35;114

Question

Consider the isotope 
Br.The atomic number is ________,and the mass number is ________.
A)79;35 
B)35;79 
C)44;35 
D)35;44 
E)35;114

Quizplus · Accepted Answer

The atomic number is given by the subscript in the chemical symbol, which is 35 in this case since the element is bromine. The mass number is the sum of protons and neutrons in the nucleus, which is 79. Therefore, the correct option is B, with the atomic number first and the mass number second.

Consider the Isotope