Addison Griffin's Week 4 Vocabulary

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Across
  1. 2. the number of protons in a nucleus in an atom
  2. 6. an arrangement of elements in order of their atomic number such that elements with similar properties fall in the same group
  3. 7. the smallest unit of an element that maintains the properties of that elements
  4. 8. in chemistry, a column in the periodic table of the chemical elements
  5. 10. A subatomic particle located in the nucleus of an atom; positively charged
Down
  1. 1. nuclear physics, the sum of the numbers of protons and neutrons present in the nucleus of an atom.
  2. 3. A subatomic particle that has a negative charge
  3. 4. A subatomic particle that has no charge and is located in the nucleus of an atom
  4. 5. a substance that can't be separated or broken
  5. 9. 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.