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a
Orbit is a three dimensional area where probability finding electron is maximum.
b
Orbit is a two dimensional track on which electron moves
c
Atom has definite boundary
d
Energies and angular momentum of orbits are quantized.
answer is A.
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Detailed Solution
It is orbital not orbit [orbit was proposed by Bohr] which is a three dimensional area where probability of finding electron is maximum. Orbital was defined by quantum mechanics.