Atomic structure

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Across
  1. 2. the number of electrons you can have in the second shell
  2. 4. Mendeleev arranged his elements in order of Atomic ______ ( or _____ number).
  3. 6. Columns of the periodic table
  4. 7. This is a subatomic particle of the atom which has no charge
  5. 9. This is subatomic particle with a negative charge
  6. 11. Elements in the same group have similar _____
Down
  1. 1. Electrons are arranged in a series of _____
  2. 3. A type of element with the same number of protons but different number of neutrons
  3. 4. Russian chemist who grouped atoms in a way which led to the periodic table we know today
  4. 5. This subatomic particle has a relative charge of +1
  5. 8. Rows of the periodic table
  6. 10. the number of electrons you can have in the first shell
  7. 12. Acronym (3 letters) for the atomic mass calculated by using the abundance of different isotopes