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Across 6. the number of protons in the nucleus of an element (2 Words) 7. an electron in the highest occupied energy level of an atom (2 Words) 8. vertical column in the periodic table 10. the weighted average of the masses of the isotopes of an element (2 Words) 14. type of element that is a good conductor of heat and electric current 15. Atoms react so as to acquire the 8 valence electrons and a stable electron structure of a noble gas. (2 Words) 16. atom or group of atoms having a negative charge

Down 1. one-twelfth the mass of a carbon atom having six protons and six neutrons (3 Words) 2. a depiction of valence electrons around the symbol of an element (3 Words) 3. produces a hydroxide ion when dissolved in water 4. horizontal row in the periodic table 5. subatomic particles that are transferred to form positive and negative ions 9. the total number of protons and neutrons in the nucleus of an atom (2 Words) 11. atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom 12. produces a hydrogen ion when dissolved in water 13. atom or group of atoms having a positive charge