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It is known as exicted shell when a valence electron absorbs energy.
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excited shell of an atom i mean
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when the electrons of an atom absorb energy the they jump the shells

The shells in which they jump are called as excited shell

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why is hydrogen's 2nd shell known as the 1st excited shell
because if the electron in the 1st shell excites then it moves to the 2nd shell and thus the 2nd shell is the excited shell
then in this case the first shell should be the 1st excited shell
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