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12 terms

Science (grade 7) Atoms and Periodic table study guide

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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