Spencer Heim week 6 vocabulary

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Across
  1. 5. an arrangement of elements in order of their atomic number
  2. 7. the smallest unit of an element
  3. 10. a subatomic particle that has a negative charge
Down
  1. 1. the number of neutrons in the nucleus of an atom
  2. 2. in chemistry, a column in the periodic table of the chemical elements.
  3. 3. A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements.
  4. 4. a subatomic particle that has a positive charge
  5. 6. a substance that cannot be separated or broken down.
  6. 8. a subatomic particle that has no charge
  7. 9. in nuclear physics, the sum of the numbers of protons and neutrons present in the nucleus of an atom.