7 ⚛️ Atoms & Periodic Table 👩‍🏫

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Across
  1. 2. - a subatomic particle that has no charge and that is found in the nucleus of an atom
  2. 3. - the average mass of all the isotopes of an element
  3. 5. - _______ electron is an electron that is found in the outermost shell of an atom and that determines the atom's chemical properties
  4. 9. - a horizontal row of elements in the periodic table
  5. 10. - the number of protons in the nucleus of an atom
  6. 11. - an atom with the same number of protons and a different number of neutrons from other atoms of the same element
  7. 12. - A subatomic particle that has a negative charge
Down
  1. 1. - the center of an atom, which contains the protons and neutrons
  2. 4. - an atom or group of atoms that has a positive or negative charge
  3. 6. - the basic unit of a chemical element
  4. 7. - electron ______ is a region around the nucleus of an atom where electrons are likely to be found
  5. 8. - a vertical column of elements in the periodic table
  6. 9. - a positively charged subatomic particle