An electronic transition from 1s orbital of a | vedclass

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(A) The $1s$ orbital is the lowest energy state (ground state) for an electron in an atom.Since the electron is already at the minimum possible energy

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Absorption of energy

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(A) The $1s$ orbital is the lowest energy state (ground state) for an electron in an atom.Since the electron is already at the minimum possible energy level,it cannot lose energy to transition to a lower state.Therefore,any electronic transition starting from the $1s$ orbital must involve the absorption of energy to move the electron to a higher energy orbital.

An electronic transition from $1s$ orbital of an atom causes

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