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Across 5. side of the periodic table where metals are located 9. part of the atom found outside the nucleus with a negative charge 11. property that can be observed or measured only by altering the chemical make-up of a substance (2 Words) 13. this is primarily arranged by increasing atomic numbers, yet also groups elements of similar properties together (2 Words) 15. can be stretched into a wire (physical property) 17. atoms with a different number of neutrons in the nucleus;different atomic mass 18. equal to the number of protons + neutrons in the nucleus of an atom (2 Words) 19. a (horizontal) row of elements in the periodic table 20. side of the periodic table where nonmetals are located 21. a (vertical) column of elements in the periodic table

Down 1. able to easily transmit heat or electricity (physical property) 2. part of the atom found within the nucleus with a postive charge; unique for every element 3. location of metalloids on the periodic table 4. aka "shiny" (physical property) 6. aka "burning" (chemical property) 7. property that can be observed or measured without altering the chemical make-up of a substance (2 Words) 8. category of elements on the periodic table that share properties of both metals and nonmetals 10. equal to the number of protons in the nucleus of an atom; unique for every element (2 Words) 12. physical property that describes the amount of matter in a given space 14. part of the atom found within the nucleus with a neutral charge 16. category of elements that are nonconductive, brittle, dull, and may form anions (ex: carbon, oxygen) 17. atoms that have gained or lost an electron;different charges (+ or -) 18. category of elements that are conductive, malleable, have luster, form cations, react to acid (ex: iron, gold)