Question

What are the symbols used for the shells which accommodate the electrons in various atoms?

Answer 1

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ELECRON shell


Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.

Answer 2

All the shells are represented by letters called K, L, M, N shells.

These shells accommodate different number of valence electrons depending on the chemical properties of that element.

For example : Hydrogen has atomic number 1. So the valence electrons in the shells are represented as : K - 1

Sodium has atomic number 11. So it will be represented as K - 2, L - 8, M - 1

So all the shells are represented with different alphabets. Also the number of electrons that can be accommodated in a shell can be given by the formula 2n², where n represents the number of shells.