Science (grade 7) Atoms and Periodic table study guide

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12 terms

Proton

A positive charged atom

Nuetron

An atom with no charge(neutral)

Electron

A negative charged atom

Atomic Mass Unit

The SI unit used to express the masses of particles in atoms

Atomic Number

The number of protons in the nucleus of an atom

Atomic Mass

The weighted average of the masses of all the naturally occurring isotopes of that element.

Isotope

Atoms that have the same number of protons but have different numbers of neutrons

Ion

When you add or loose electrons

Periodic

Happening at regular intervals

Periodic Law

Law states that the repeating chemical and physical properties of elements change periodically with the elements atomic numbers

Period

Each horizontal row of elements(from left to right) on the periodic table

Group

Each vertical column of elements(from top to bottom) on the periodic table

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