Question

what is atomic number mass number and electronic configuration give the example

Answer 1

Atomic mass number is the number of protons.
Electronic configuration is the description of the number of shells and the valence electrons.

Answer 2

Hlo friend.. Cutiepie Here..

Here is ur answer :

ATOMIC NUMBER

The number of protons present in the nucleus of the atom of an element is called its atomic number.

Atomic number = Number of protons

For example : Sodium atom has 11 protons . Thus, its atomic number is 11. It is represented by Na.
¹¹

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MASS NUMBER

The sum of number of protons and neutrons ( nucleons ) present in the nucleus of an atom is called its mass number.

Mass number = Number of protons + Number of neutrons.

For example : Sodium atom has 11 protons and 12 neutrons. Its mass number is 23. It is represented as ²³Na.

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ELECTRONIC CONFIGURATION

Electronic configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.

For example :

Electronic configuration of element sodium =

K L M

2 8 1

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HOPE IT HELPS YOU..

REGARDS
@sunita