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Across 3. type of bond between atoms in which the electrons are shared 4. smallest unit of most compounds that displays all the properties of that compound 8. the basic unit of matter 9. negatively charged particle; located in the space surrounding the nucleus 10. chemical bond fromed when one or more electrons are transferred from one atom to another 11. the center of an atom, which contains the protons and neutrons; in cells, structure that contains the cells; genetic material in the form of DNA

Down 1. slight attraction that develops between oppositely charged regions of nearby molecules 2. atom that has a positive or negative charge 5. one of several forms of a single element, which contains the same number of protons but different numbers of neutrons 6. pure substance that consists entirely of one type of atom 7. substance formed by the chemical combination of two or more elements in definite proportions