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Elements/Ions/Isotopes

Across
Negatively charged atom or molecule (contains more electrons than protons)
Each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter
Positively charged atom or molecule (contains fewer electrons than protons)
Average mass of atoms of an element, expressed in amu
The relative number of atoms of the different isotopes of one chemical element
Electrostatic forces of attraction between the oppositely charged ions of an ionic compound
Negatively charged, subatomic particle of relatively low mass located outside of the nucleus
Electrically charged atom or molecule (contains unequal numbers of protons and electrons)
Down
Positively charged, subatomic particle located in the nucleus
The electrical charge of an ion, created by the gain (negative charge) or loss (positive charge) of one or more electrons from an atom or group of atoms
sum of the number of neutrons and protons in the nucleus of an atom
Atoms that contain the same number of protons but different number of neutrons
Compound composed of cations and anions combined in ratios, yielding an electrically neutral substance
Unit of mass equal to 1/12 of the mass of a a 12C atom
Uncharged, subatomic particle located in the nucleus
The basic unit of a chemical element