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18 August, 11:22

What is the meaning of 1s2 electron configuration (tell what 1 means, the s means and the superscript of 2 means) ?

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  1. 18 August, 13:25
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    The electrons around an atom occupy orbitals called shells in a fixed order. The s orbital is the first and smaller and can hold 2 electrons.

    In this case, there are 2 electrons in this atom as 2 electrons are in the s orbital.
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