Given an element’s atomic number and mass number, how can you tell the number of protons and neutrons in its nucleus?
A Number of protons = mass number; number of neutrons = atomic number – mass number
B Number of protons = atomic number; number of neutrons = mass number + atomic number
C Number of protons = atomic number; number of neutrons = mass number – atomic number

The answer would be C

Explanation: When looking at a periodic table, the atomic number tells you the element’s identity as well as atomic number. For neutrons, you have to subtract the atomic number from the mass.

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.