Question

Which term best indicates the total number of neutrons and protons in a particular isotope of an element?

atomic number
   mass number
   group number
   atomic mass

Answer 1

Mass number.

The atomic number just describes the number of protons, the group number identifies which column of a standard periodic table an element can be found in, and the atomic mass is just the mass of the atom.

Answer 2

The correct options are Option B.

Which is mass number best indicates the total number of neutrons and protons.

Step-by-step explanation:

• Mass number is the sum of number of neutrons and number of protons in the nucleus.
• Nucleon number is also known as mass number.
• For example mass number of Carbon is twelve(12).