ion - an atom that gains or loses an electron making it positive or negative charge, isotope - an atom that has a different number of neutrons, element - matter composed of only one type of atom, proton - positive particle in the nucleus, electron - negative particle found in an atom, atomic number - the number of protons in an atom , nucleus - composed of protons and neutrons, valence electrons - electrons in the outer most shell, ionic bond - when two atoms attract each other due to their positive and negative charge, covalent bond - when two atoms share an electron, period - horizontal rows on periodic table based on the number of shells an atom has, group - vertical columns on the periodic table based on the number of valence electrons in an atom,

Atomic Vocabulary

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