Question

Siven an element's atomic number and mass number, how can you tell the number of protons and neutrons in its nucleus?

Jumber of protons = atomic number; number of neutrons = mass number - atomic number
Number of protons = atomic number; number of neutrons = mass number + atomic number
Number of protons = mass number; number of neutrons = atomic number - mass number

Answer 1

It would be the first option.

Explanation-
The number of protons is equal to the atomic number the number of neutrons is the mass minus the atomic number.

Answer 2

Number of protons = atomic number; number of neutrons = mass number - atomic number

Step-by-step explanation:

Z = atomic number = number of protons

A = mass number = number of protons + number of neutrons

Mass number = atomic number + number of neutrons

Number of neutrons = mass number - atomic number