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Chapter 4 Vocab

Some words are two words with no spaces
Across
The amount of energy needed to pull an electron away from an atom
The total mass of an atom.
A representation of a system that helps us predict how the system behaves
An electrically neutral subatomic particle found in atomic nuclei
Extremely small, negatively charged sub-atomic particle found outside the atomic nucleus.
Down
A positively charged subatomic particle in atomic nuclei
The number of protons in the atomic nucleus of each atom of a given element
The number of protons plus neutrons in the atomic nucleus
The dense, positively charged center of every atom
A representation of an object on some convenient scale
Any member of a set of atoms of the same element whose nuclei contain the same number of protons but different number of neutrons