Answer:
In a helium atom (2He4),
there are two protons and two neutrons in the nucleus. Two electrons are
revolving around the nucleus in the first orbit. We are given that there is no repulsive
force between the electrons. For He nucleus, charge, Z = + 2 e. As two
electrons of charge (- 2 e) revolve around the nucleus, therefore, the formula
for energy in nth orbit would be
The ground state will have two electrons, each of energy
The total ground state energy of He
atom
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