Elements

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Mass Moles Number of Particles Assignment

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An Element

Made up of an ATOM

Combine with other atoms to form

Molecues

Containing different kind of atoms

Molecules of compounds

Cl2

CO2

Containing same kind of atoms

Molecules of elements

Examples:

Oxygen gas

Chlorine gas

Nucleus

Protons

+1

Neutrons

0

1

Electrons

Charge:

-1

Mass:

1/2000