Discovering Atmos Chpt 3

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Across
  1. 1. The atomic _____ is calculated from the number of protons and neutrons in an atom’s nucleus.
  2. 3. Kr
  3. 7. Horizontal row on the periodic table of elements.
  4. 12. The three, broad categories of elements are based on similar __________.
  5. 14. A Category of elements that have metallic gleam but are more fragile, can conduct heat and electricity weakly.
  6. 15. An atom with an unusual number of neutrons.
Down
  1. 1. The largest category of elements on the table which are good conductors of electricity, have a metallic sheen, and are malleable.
  2. 2. Each element is given a ______ with a capital and sometimes lowercase letter.
  3. 4. symbol for Sodium
  4. 5. A category of elements on the table which includes hydrogen, halogen gases, chalcogens, and noble gases.
  5. 6. Vertical Columns of the chart.
  6. 8. The _____ table of elements
  7. 9. Br
  8. 10. The period table of elements organizes elements by their _______ number.
  9. 11. Atomic mass – Atomic number = number of _______ .
  10. 13. Atomic number of Oxygen