Periodic Table

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1234567891011121314151617
Across
  1. 4. Atoms of the same element with different numbers of neutrons.
  2. 6. The smallest unit of matter that retains the properties of an element.
  3. 8. A horizontal row in the periodic table indicating energy levels.
  4. 9. A neutral particle located in the nucleus of an atom.
  5. 10. An element in Group 17, highly reactive nonmetals.
  6. 15. The outermost electrons involved in chemical bonding.
  7. 16. The arrangement of electrons in an atom’s orbitals.
  8. 17. Elements in Groups 312, metals with variable oxidation states.
Down
  1. 1. A vertical column in the periodic table that shares similar properties.
  2. 2. An element that is brittle and a poor conductor of heat and electricity.
  3. 3. Refers to noble gases in Group 18, which are inert and stable.
  4. 5. A pure substance consisting of only one type of atom.
  5. 7. An element with properties of both metals and nonmetals.
  6. 8. A positively charged particle found in the nucleus of an atom.
  7. 11. Elements in Group 1, highly reactive metals.
  8. 12. A negatively charged particle that orbits the nucleus of an atom.
  9. 13. An element that is shiny, malleable, and a good conductor of heat and electricity.
  10. 14. Elements in Group 2, reactive metals but less than alkali metals.