What are nucleons?

Symbols $_{35}^{79} Br$ and $^{79} Br$ can be written,whereas symbols $_{79}^{35} Br$ and $^{35} Br$ are not acceptable. Answer briefly.

Calculate the number of protons, neutrons and electrons respectively in ${}^{14}_{7}N^{3-}$.

Positive ions are formed from the neutral atom by the

Which one of the following sets of ions represents a collection of isoelectronic species? (Given: Atomic Number: $F: 9, Cl: 17, Na: 11, Mg: 12, Al: 13, K: 19, Ca: 20, Sc: 21$)

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