subatomic particle that orbits teh nucleus of an atom that has a negative charge

each vertical column of elements from top to bottom on the periodic table

the speed of an object in a particular direction

a force of attraction between objects that is due to their masses

the dense, positively charged region in the center of an atom made up of protons and neutrons

the average mass of the different forms of that atom's element

each horizontal row of elements from left to right on the periodic table

a measure of the gravitiontational force exerted on an objectt

formula for calculating speed

the number of protons in the nucleus of an atom

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