Answer:
The
distribution of electrons in various shells of an atom is called electronic configuration.
In order to write the electronic configuration of an element, one should proceed
as follows:
(i) With the help of atomic number of the element, find
out the total number of electrons present in atom.
(ii) Allot these electrons in the various shells one by
one in the order of increasing energy according to 2n2 rule.
(iii) The shell having least energy should be filled first
and then the other shells of increasing energies are filled.
(iv) Write the name and number of electrons in various
shells, starting with the lowest. Each shell is separated from the other shell
by a comma. For example, sodium (atomic number 11) has 11 electrons in its
atom.
According to 2n2 rule, K shell should be filled
with 2 electrons and then L shell will be filled with 8 electrons and in the
end one left electron will go to N shell.
Electronic configuration of Na
will be K = 2, L= 8, M = 1
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