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Atoms and the Periodic Table

Across
How much matter an object is made up of.
The # of protons plus nuetrons (P+N)
A substance made of just one type of atom which cannot be broken down or changed into another substance
The letter (s) that represents the element
The positively charged part of an atom; found in the nucleus
The center of an atom
Anything that has mass and takes up space
Down
The smallest whole unit of matter
The # of protons which is equal to the # of electrons (P=E)
The name of the element
The part of the atom that has no charge; found in the nuclues
The negatively charged part of an atom; found orbiting the nucleus