The two stable isotopes of carbon present in naturally occurring carbon are

Assertion : An atom is electrically neutral.
Reason : Atom contains equal number of protons and neutrons.

The metal ion with total number of electrons same as $S^{2-}$ is

Which of the following has the smallest size?

The spectrum of $He$ is expected to be similar to

Provide the symbol,name,atomic number $(Z)$,mass number $(A)$,and the number of electrons $(e)$,protons $(p)$,and neutrons $(n)$ for elements with atomic numbers $1$ to $10$.