Element Explorer Crossword

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Across
  1. 5. scientist who organized the first widely accepted periodic table.,MENDELEEV
  2. 6. tendency or ability of a substance to undergo a chemical change.,REACTIVITY
  3. 8. pure substance consisting only of atoms that have the same number of protons.,ELEMENT
  4. 11. 6)",The number of protons in the nucleus; this unique value defines an element's identity (two words).,ATOMIC NUMBER
  5. 12. 4)",The weighted average of the masses of all natural isotopes of an element (two words).,ATOMIC MASS
  6. 15. that is typically brittle, dull, and gains electrons in chemical reactions.",NONMETAL
Down
  1. 1. vertical column on the periodic table; also called a family.,GROUP
  2. 2. found along the zigzag line that have properties of both metals and nonmetals.,METALLOID
  3. 3. 5)",Group 18 elements that are inert due to a full outer electron shell (two words).,NOBLE GASESNo.,Word Length,Accurate Clue,Answer
  4. 4. 17, known as the salt-formers; the most reactive nonmetals.",HALOGENS
  5. 7. 6)","Group 1 metals; soft, shiny, and highly reactive with water (two words).",ALKALI METALS
  6. 8. 9)","The electrons located in the outermost shell, determining chemical behavior (two words).",VALENCE ELECTRONS
  7. 9. row on the periodic table; indicates the number of electron shells.,PERIOD
  8. 10. of the same element (same protons) that have a different number of neutrons.,ISOTOPE
  9. 13. class of elements that are lustrous, malleable, ductile, and good conductors of electricity.",METAL
  10. 14. Length,Accurate Clue,Answer