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Across 2. a group of atoms bonded together 5. the basic unit of a chemical element. 6. a useful tabular arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties 7. the state or power of being reactive or the degree to which a thing is reactive. 8. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign. 9. an element that doesn't have the characteristics of metal including: ability to conduct heat or electricity, luster, or flexibility. 10. any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 12. Russian chemist 13. an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. They are electrical semiconductors. 15. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen. 16. each of the actual or potential patterns of electron density that may be formed in an atom or molecule by one or more electrons, and that can be represented as a wave function.

Down 1. a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself. 3. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids. 4. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table. 6. the name given to a horizontal row of the periodic table 11. species of atoms having the same number of protons in their atomic nuclei. 13. ny chemical element that is an effective conductor of electricity and heat can be defined as a 14. column of elements in the periodic table of the chemical elements