## If K and L shells of an atom are full, then what would be the total number of electrons in the atom?

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Answer
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Based on the
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Bohr-Bury scheme,
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we know that
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the maximum number of electrons
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that can be present
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in a particular energy shell
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of an atom is given by
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2n
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2
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,
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where “n” is the number of energy shells.

Maximum Number of electrons in n th shell = 2n 2

For K shell, n =1

Maximum electrons = 2 x 1 2

= 2 x 1

=
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2 electrons
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For L shell, n =2

Maximum electrons = 2 x 2 2

= 2 x 4

=
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8 electrons
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Total number of electrons =
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Number of electrons in K Shell + Number of electrons in L Shell

= 2 + 8

=
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10 electrons
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There would be a total of 10 electrons if K and L shells are full.