Question

According to which rule there should be two electrons in the innermost shell

Answer 1

In chemistry and atomic physics, an electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus. The closest shell to the nucleus is called the "1 shell" (also called "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on farther and farther from the nucleus. The shells correspond with the principal quantum numbers (n = 1, 2, 3, 4 ...) or are labeled alphabetically with letters used in the X-ray notation (K, L, M, …).

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Answer 2

the rule says that the no. of electrons in a given shell are given by 2n^2 where n is the no. of shell.

if we take n as 1 then (taking the no. of

electrons in the 1st shell)

2*1*1

=2