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Structure of an atom
Protons
Neutrons
Electron
Atomic number
Mass number
Atomic number and mass number
The periodic table has no charge
Summary Structure of an Atom
Relative mass of particles
Hydrogen
Isotopes
Electron shells
Electron shells and 2, 8, 8
Ions
Valency
Relative atomic mass and relative formula mass

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Electrons

Electrons (electronic robots) are negatively charged.

The electronic (electron) robots were built with a negative sign for a mouth to remind you that electrons are negatively charged. — The electronic robots (electrons) are negative and have a negative charge.

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