The Periodic Table

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Across
  1. 2. My atomic number is 79.
  2. 3. An atom with a unique number of protons is called an ____________.
  3. 6. The horizontal rows of the periodic table are called ____________.
  4. 10. My atomic number is 47 and I am used to make photographic film.
  5. 12. The number of protons in the nucleus of atoms gives an element its ____________ ____________.
  6. 13. The element with the atomic number 92 is ____________.
  7. 14. I have 2 electrons in the first shell, 8 in the second shell, and 6 in the third shell.
  8. 16. I have 20 neutrons and am found in your teeth and bones.
  9. 19. The outer energy level of electrons are called the ____________ level.
  10. 21. The vertical columns of the periodic table are called ____________.
  11. 22. I am the head of the group 4 and am known as the “basis of life”.
  12. 23. The atomic ____________ is the number of protons in the nucleus of an element.
Down
  1. 1. The positively charged particles found in the nucleus of an atom.
  2. 4. Negatively charged particles that circle the nucleus of atoms are called ____________.
  3. 5. The elements in group 1 are the ______________ _____________.
  4. 7. Atoms which have gained or lost electrons are called ____________.
  5. 8. ________________ of an element have the same atomic number but different atomic masses.
  6. 9. I am a noble gas with 2 electrons.
  7. 11. The shape of the orbits of electrons are called ____________.
  8. 15. The ____________ is the centre of the atom.
  9. 17. I am a metal that is liquid at room temperature.
  10. 18. I am not really an alkali metal, but since I have only 1 electron I behave like them.
  11. 20. The smallest particle of a substance which retains the properties of that substance.