Match the names of the scientists given in column $A$ with their contributions towards the understanding of the atomic structure as given in column $B$.

Column $A$	Column $B$
$(a)$ Ernest Rutherford	$(i)$ Indivisibility of atoms
$(b)$ $J$.$J$. Thomson	$(ii)$ Stationary orbits
$(c)$ Dalton	$(iii)$ Concept of nucleus
$(d)$ Neils Bohr	$(iv)$ Discovery of electrons
$(e)$ James Chadwick	$(v)$ Atomic number
$(f)$ $E$. Goldstein	$(vi)$ Neutron
$(g)$ Mosley	$(vii)$ Canal rays

(A) $(a)-(iii)$: Ernest Rutherford proposed the nuclear model of the atom, introducing the concept of the nucleus.
$(b)-(iv)$: $J$.$J$. Thomson discovered the electron through his cathode ray experiments.
$(c)-(i)$: John Dalton proposed the atomic theory, which stated that atoms are indivisible.
$(d)-(ii)$: Neils Bohr proposed that electrons revolve in discrete stationary orbits around the nucleus.
$(e)-(vi)$: James Chadwick discovered the neutron.
$(f)-(vii)$: $E$. Goldstein discovered canal rays (protons) in a discharge tube.
$(g)-(v)$: Henry Moseley discovered the concept of atomic number.