Mass number and Atomic number

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9 Terms

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protons

Positively charged

Relative mass 1

Relative charge +1

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Neutrons

Neutrons are electrically neutral

Relative mass 1

Relative charge 0

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Electrons

Relative charge -1

Relative Mass 1/2000

Orbit around the nucleus in shells or orbital

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Nucleus

Located in center of the atom

Neutral

Small and dense

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Mass number ( A )

the total number of nucleons ( protons + neutrons ) in the nucleus

Top number on p table

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Atomic number ( z)

The number of proton in the nucleus, identifies the element

Bottom number in p table

Protons = z number

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Negative ions

have more electrons than protons

Eg ; A particle with 1 proton and 2 electrons → negative ion charge of -1

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