(i) State Pauli's exclusion principle. (ii) Account for the following: (a) Chromium has configuration `3d^5 4s^1` and

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Q 3172191036.     (i) State Pauli's exclusion principle.
(ii) Account for the following:
(a) Chromium has configuration `3d^5 4s^1` and
not `3d^4 4s^2`
(b) Bohr's orbits arc called stationary orbits
or states.

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