Atoms, Elements & Compounds

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Across
  1. 3. Evidence of a chemical reaction could be that the temperature goes ____ .
  2. 6. You would find ______ and neutrons in the nucleus
  3. 9. Look at your periodic table. Which element has 3 protons?
  4. 13. What charge does a proton have?
  5. 14. Look at your periodic table. Which element has an atomic mass of 24?
  6. 15. The element with the symbol C
  7. 16. This is formed when two or more atoms are bonded together. (M ________ )
  8. 18. The element with the symbol Pb
  9. 19. The element with the symbol O
  10. 20. Element with the symbol Al
  11. 21. Which subatomic particle has a neutral charge?
  12. 23. Element with the symbol Fe.
  13. 25. Evidence of a chemical reaction could be that there is a change of _______
  14. 26. Evidence of a chemical reaction could be that it gives out _______ (e.g. glow sticks)
  15. 27. Potassium + Oxygen -----> ________
Down
  1. 1. Dissolving, evaporating and melting are all examples of ________ changes because they can be reversed easily
  2. 2. The element with the symbol Cu
  3. 4. Overall, the nucleus has a ______ charge
  4. 5. When two or more atoms of DIFFERENT elements bond together you would make this. (C ________ )
  5. 7. Lithium + Oxygen ----> __________
  6. 8. Reactions such as Magnesium + Oxygen are known as _______ changes because they are difficult to reverse
  7. 10. Iron + Oxygen ----> _______
  8. 11. This is how many electrons you can fit in the second and third orbitals
  9. 12. We made this when we reacted Magnesium +Oxygen in the bunsen burner
  10. 17. Which subatomic particle would you find in orbitals around the nucleus?
  11. 21. What charge does an electron have?
  12. 22. Most of the mass of an atom is found in the _______ (middle)
  13. 24. This is how many electrons you can fit in the first orbital
  14. 25. Carbon + Oxygen ---> ___________