Atoms and Electron Structure

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Atoms and Electron Structure

Atomic Structure

The nucleus contains almost all of an atom because that is where the protons are found.

The nucleus of an atom contains all of the positive charge and the electrons are negative.

Atomic number: the number of protons in the nucleus

Mass number: number of protons and neutrons in the nucleus

Number of neutrons: mass number - atomic number

Number of electrons: number of protons (in a neutral atom)

Isotopes and Ions