An electronic transition from 1s orbital of an atom causes

Absorption of energy

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Release of energy

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Both release or absorption of energy

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Unpredictable

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Solution

The correct option is A Absorption of energy
1s orbital is the very ground state for an atom hence there always be absorption of energy if an electron transition takes place.
Option A is correct.

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} 4 s^{2}

Statement 2: In the periodic table atoms of transition elements 1s, 2s, 2p, 3s,and 3p orbitals are completely filled in the ground state.

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