Six protons are found in the nucleus of

If $W$ is the mass number and $N$ is the atomic number of an element,then:

Assertion : Atoms are not electrically neutral.
Reason : Number of protons and electrons are different.

The number of protons,electrons and neutrons in a species are equal to $17$,$18$ and $18$ respectively. Which of the following will be the proper symbol of this species?

What are atomic number,nucleons,and mass number? Give the relation between them.

Number of neutrons in ${}^{12}C$ is