Periodic+Table+Test+Answers

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1. Elements in group 18 are inert gases meaning they are nonreactive due to having 8 outer electrons. 2. Metals are found to the left of the zigzag line and in the two rows below the table. The metals left the table because the nonmetals were always right. 3. Elements in group 16 are nonmetals or a semimetal with 6 outer electrons. 4. Vertical columns are groups in the Periodic Table (Groups have similar properties) 5. How many protons does a atom of krypton have? 6. Atomic masses increase as you move down the periodic table. 7. Isotopes have the same number of protons, but different numbers of neutrons. 8. Radioactive elements emit particles and gamma rays. 9. Properties of metals are: high thermal conductivity, electrical conductor, hardness, shiny, ductile, malleable 10. Elements in the same column or group are most likely to have similar properties. (Because they all have the same number of outer electrons) 11. In general Nonmetals are brittle and dull: 12. Group 18 are the least reactive elements. 13. Substance A is hard, shiny, and conducts both heat and electricity. Substance B is brittle, dull, and conducts neither heat nor electricity. Substance A is a ……. Substance B is a ……. 14. In MgO the ratio of Mg to O atoms is 1 to 1. 15. An atom that loses a valence electron becomes a positive ion. (Losing a negatively charged electron leaves the atom with a positive charge.) 16. The attraction of positive and negative ions is an ionic bond. 18. Substances with repeating patterns of oppositely charged ions are ionic compounds.