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Download 1. The central core of the atom, containing protons and usually
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1. The central core of the atom, containing protons and usually neutrons NUCLEUS PROTON • Small positively charged particles that are found in the nucleus of an atom NEUTRON • Small uncharged particles that are found in the nucleus of an atom ELECTRON • Tiny, negatively charged, high-energy particles that move around outside the nucleus of an atom VALENCE ELECTRONS • The electrons that are farthest away from the nucleus of an atom and are involved in chemical interactions. ELECTRON DOT DIAGRAM A representation of the number of valence electrons in an atom, using dots placed around the symbol of an element ATOMIC NUMBER • The number of protons in the nucleus of an atom GROUP • Elements in the same vertical column of the periodic table. Also called family. PERIOD • Elements in the same horizontal row of the periodic table. HALOGEN REACTIVE NON METAL • An element belonging to Group 17 of the periodic table. ION • An atom or group of atoms that has become electrically charged. IONIC BOND • The attraction between oppositely charged ions. POLYATOMIC ION • An ion that is made of more than one atom. CRYSTAL • An orderly, three-dimensional pattern of ions or atoms in a solid. MINERAL • A naturally occurring solid that has a crystal structure and a definite chemical composition.