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Across 2. element that lacks most of the properties of a metal 4. the way a material reflects light 7. number of protons and neutrons in the nucleus of an atom 11. shortened way of writing the name of an element 15. able to be drawn into thin wires 17. particle that has a negative charge 18. element that has the property of shiny luster,ductility and malleability 19. repeating pattern

Down 1. particles that has no charge 3. number of protons in the nucleus of an atom 5. place in an electon cloud where an electron is most likely to be found 6. able to be hammered into different shapes 8. particle that has a positive charge 9. center or core of an atom 10. total mass of the protons and neurons in an atom measured in atomic mass units 12. horizontal row of elements in the periodic table 13. substance that cannot be chemically broklen down into simpler substances 14. vertical column of elements in the periodic table 16. smallest part of an element that can be identified as that element