Multiple Choice Questions

Identify the ${\mathrm{Mg}}^{2+}$ ion from the figures given below where, $\mathrm{n}$ and $\mathrm{p}$ represent the number of neutrons and protons respectively

Elements with valency $1$ are

The first model of an atom was given by

An atom with $3$ protons and $4$ neutrons will have a valency of

The electron distribution in an aluminium atom is 

Which of the following figures do not represent Bohr's model of an atom correctly?

Which of the following statement is always correct?
 

Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
(i) Rutherford's atomic model
(ii) Thomson's atomic model
(iii)Bohr’s atomic model