Question

The number to the right of an element's symbol (ex. C-12) identifies the _____ of an isotope. A. atomic mass B. mass number C. atomic mass unit D. average atomic mass

Answer 1

Answer:

Atomic Mass

Explanation:

it is also sometimes below the symbol of the element :)

Answer 2

Answer: Option (A) is the correct answer.

Explanation:

Atomic mass is defined as the summation of total number of protons and neutrons present in an element.

For example, in $^{12}C$ the number 12 represents the total number of protons and neutrons present in it.

As it is known that an atom of carbon always contains 6 protons but it can hold different number of neutrons.

Hence, in $^{12}C$ the number 12 represents the atomic mass.

Therefore, we can conclude that the number to the right of an element's symbol (ex. C-12) identifies the atomic mass.