Atoms, Ions and Isotopes

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Across
  1. 4. carbon-13
  2. 5. The region where electrons are likely to be found.
  3. 6. Vertical column on the periodic table
  4. 11. Atoms of the same element with different numbers of neutrons.
  5. 12. substances that have high melting points, high conductivity and are shiny
  6. 13. Substances that have low melting points, low conductivity and are dull and brittle
  7. 15. Seperates the metals from the nonmetals on the periodic table
  8. 17. Discovered the electron.
  9. 19. The number of protons and neutrons in an atom.
  10. 20. Particles with a negative charge.
  11. 21. Horizontal row on the periodic table
Down
  1. 1. Number The number of protons in an atom.
  2. 2. Proposed the planetary model of the atom with electrons orbiting the nucleus.
  3. 3. Atoms with the same number of protons but different numbers of neutrons
  4. 7. Particles with a positive charge and mass of 1amu
  5. 8. The theory that states atoms are indivisible and indestructible.
  6. 9. The central part of an atom, containing protons and neutrons.
  7. 10. Outer level/shell with electrons
  8. 14. The smallest particle of an element that retains its chemical properties.
  9. 16. Atoms with a different number of electrons than protons.
  10. 18. Proposed the quantum model of the atom with electron probability clouds.