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Question

Which of the following statements are true about an element having an atomic number of 11?

A
It has 2 electrons in its M shell.
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B
It has 8 electrons in its L shell.
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C
It has 9 electrons in its L shell.
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D
It has 2 electrons in its K shell.
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Solution

The correct options are
B It has 8 electrons in its L shell.
D It has 2 electrons in its K shell.
The element which has atomic number 11 is sodium.

The maximum number of electrons that can be accommodated in the nth shell of any atom is given by 2 × n2. The electronic configuration of sodium is as follows.
ShellKLMNo. of electrons 2 8 1
So, sodium has 2 electrons in its K shell, 8 electrons in its L shell and 1 electron in its M shell.

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