If K and L shells of an atom are
full, then what would be the total
number of electrons in the atom?
Helium atom has an atomic mass
of 4 u and two protons in its
nucleus. How many neutrons
does it have?
What do you think would be the
observation if the α-particle
scattering experiment is carried
out using a foil of a metal other
than gold?
On the basis of Rutherford’s
model of an atom, which sub-
atomic particle is present in the
nucleus of an atom?
On the basis of Thomson’s model
of an atom, explain how the atom
is neutral as a whole.
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