Question

Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements.

Answer 1

Answer:-

The distribution of elements in different orbits is governed by a scheme called Bohr-Bury scheme. There are following rules:

(i) The maximum number of electrons present in any shell is given by the formula In1.

Where n = no. of orbit.

(ii) The maximum number of electrons that can be accommodated in the outermost shell is 8.

(iii) Electrons in an atom do not occupy a new shell unless all the inner shells are completely filled.

hope it helps you

Answer 2

The distribution of electrons in various shells of an atom is called its electronic configuration. For a given element, it can be written as follows:

• The maximum number of electrons which a shell can occupy is given by the formula 2n². Therefore, for K shell, n = 1. It can thus occupy 2 electrons. Similarly for L, n = 2. Thus it can occupy 8 electrons. In a similar manner, M can occupy, 18 electrons.

• The shell are filled in increasing order of energies. This is known as Aufbau's principle. Hence, the electrons are first filled in K, then L, M and so on.