An atom has mass number 37 and 18 neutrons in the nucleus. Find a) the atomic number. b) the number of Electrons c) the Number of Protons d) the name of the atom.

The mass number (A) is the sum of the atomic number (Z, number of protons) and the number of neutrons (N).

Rearrange to find the atomic number:

Substitute the given values: $A = 37$ and $N = 18$.

The atomic number is $\boxed{\text{19}}$.

For a neutral atom, the number of electrons is equal to the number of protons (atomic number).
Since the atomic number is 19, the number of protons is 19.
Therefore, the number of electrons is $\boxed{\text{19}}$.

The atomic number is defined as the number of protons in the nucleus.
Since the atomic number is 19, the number of protons is $\boxed{\text{19}}$.

An atom with an atomic number of 19 is Potassium.
The name of the atom is $\boxed{\text{Potassium}}$.