Chemistry Revision

3. atoms of the same element that have different numbers of neutrons
5. Nobel gas in period 2 of periodic table
8. the three dimensional shape of methane
11. CaO is an example of this type of compound
12. particle with a neutral charge(0) found in the nucleus of an atom
14. where the electrons are in the shells of an atom.
17. anything that is inside an atom (eg proton, neutron, electron)
20. elements with the same number of electrons in their outer shell belong to the same______
21. particle with a negative (-) charge found orbiting the nucleus of an atom
22. a common element found in many organic molecules with carbon and hydrogen
23. middle of an atom
25. the cation in sodium carbonate
27. particle with a positive (+) charge found in the nucleus of an atom
28. path an electron moves in around the nucleus of an atom
29. an atom that has gained or lost some electrons.

1. atoms of the same type, they have the same number of protons. For example, all hydrogen atoms have 1 proton, all carbon atoms have 6 protons. Hydrogen and carbon are different elements
2. the three dimensional shape of NH3
4. different compounds with the same formula
6. the electron configuration of this element is 2,8,2
7. bonding where electrons are shared
8. the number of electrons sulfur needs to get a full outer shell
9. smallest particle that something can be broken down into
10. C2H2n+2
13. element number three
15. the scientist who discovered that atoms had a positive nucleus and electrons orbited outside the nucleus
16. will not bond with another atom
17. the space that an electron is found in an atom. Different shells have different energy levels. Shell names are K, L, M ,N
18. a negative ion
19. methanol is an example
24. an ion that has lost one or more electrons
26. number of bonds carbon forms