Question
Which of the following elements have two electrons in its K shell?
Answer: Option A
:
B, C, and D
∙ The maximum electrons that a shell can accommodate is given by 2n2, where n is the shell number.
∙ So, the maximum numbers of electrons that K, L and M shells can accommodate are 2, 8 and 18 respectively.
ElementAtomic No.Electronic ConfigurationHydrogen11Helium22 Sodium 112,8,1Aluminium 13 2,8,3
∙ Hence, all the atoms except hydrogen have two electrons in its K shell.
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:
B, C, and D
∙ The maximum electrons that a shell can accommodate is given by 2n2, where n is the shell number.
∙ So, the maximum numbers of electrons that K, L and M shells can accommodate are 2, 8 and 18 respectively.
ElementAtomic No.Electronic ConfigurationHydrogen11Helium22 Sodium 112,8,1Aluminium 13 2,8,3
∙ Hence, all the atoms except hydrogen have two electrons in its K shell.
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