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atomic structure of an atomatomic structure of an atom

Protons Neutrons Electrons

The number of protons and electrons can be easily determined from the periodic table but not the number of neutrons. You have to do a little math to figure out the number of neutrons.

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Electron configuration via Aufbau principalElectron configuration via Aufbau principal

Electron Configuration

The position of electrons in different orbitals of the atom according to specific rules is called electron configuration. In the stable state, the atomic number, number of protons, and number of electrons are the same.

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valence electrons of sodiumvalence electrons of sodium

Valence Electrons

The total number of electrons in the last shell of an atom is called the valence electrons. That is, the total number of electrons in the last orbit of an element after electron configuration is called the valence electrons.

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