Argon has 3 naturally occurring isotopes , ar 36, ar 38, and ar 40. what is the mass # of each and how many protons, neutrons, and electrons are present in each?

Ar 36:  Mass number 36,  18 Protons,  18 neutrons and 18 electrons.

Ar 38:  Mass number 38,  18 Protons,  20 neutrons and 18 electrons.

Ar 40:  Mass number 40,  18 Protons,  22 neutrons and 18 electrons.

Explanation:

The number given after 'Ar'  is the mass number.

The atomic number of Argon is 18 which means that 18 protons and 18 electrons are in the atom of Argon. The mass number of an isotope = number of protons + the number of neutrons.

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.

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