2. mmcl2003 1 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 29 28 27

3. mmcl2003 2 What is an ION? A charged particle formed when electrons are gained or lost by an atom answer 1

4. mmcl2003 3 How is a positive ion formed? An outer electron(s) is lost from an atom answer 2

5. mmcl2003 4 How is a negative ion formed? An electron(s) is gained by an atom answer 3

6. mmcl2003 5 Calculate the number of protons, neutrons and electrons in 31 P ? answer 15 protons 16 neutrons 15 electrons 4

7. mmcl2003 6 Calculate the number of protons, neutrons and electrons in 23 Na + ? answer 11 protons 12 neutrons 10 electron 5

8. mmcl2003 7 Calculate the number of protons, neutrons and electrons in 16 O 2- ? answer 8 protons 8 neutrons 10 electrons 6

9. mmcl2003 8 What are BONDS? answer Attractions between atoms which hold them together 7

10. mmcl2003 9 What is a MOLECULE? A group of atoms joined together by covalent bonds answer 8

11. mmcl2003 10 What is the CHEMICAL FORMULA of a substance? It is a ratio of atoms of each element in the substance answer 9

12. mmcl2003 11 What are DIATOMIC MOLECULES? A molecule made up of 2 atoms answer 10

13. mmcl2003 12 What elements exist as diatomic molecules? H 2 N 2 0 2 F 2 Cl 2 Br 2 I 2 answer 11

14. mmcl2003 13 What is a COVALENT BOND? Atoms joining through their common attraction for a shared pair of electrons answer 12

15. mmcl2003 14 What is VALENCY? Valency = combining power of an atom Group 1 2 3 4 5 6 7 8 Valency 1 2 3 4 3 2 1 0 answer 13

16. mmcl2003 15 How is VALENCY related to the Groups in the Periodic Table? Group 1 2 3 4 5 6 7 8 Valency 1 2 3 4 3 2 1 0 answer 14

17. mmcl2003 16 Describe how to work out the chemical formula of a compound? S ymbols V alencies S wap D ivide answer 15

18. mmcl2003 17 Why do atoms bond? To get a stable electron arrangement with all the orbitals filled. answer 16

19. mmcl2003 18 Name the two types of bonding found in compounds? Covalent and ionic answer 17

20. mmcl2003 19 Which type of elements are involved in covalent bonding ? Only non-metals answer 18

21. mmcl2003 20 When two or more non-metal atoms are combined by covalent bonds, what type of particle is formed? A molecule answer 19

22. mmcl2003 21 How do electrons in a covalent bond hold the atoms together? Their negative charges attract the positive nuclei of the atoms and hold the atoms together answer 20

23. mmcl2003 22 What is the shape of a CH 4 (methane) molecule? Tetrahedral answer 21

24. mmcl2003 23 What is the shape of the NH 3 molecule ? Pyramid answer 22

25. mmcl2003 24 What is the shape of the H 2 O molecule ? Angular (bent) answer 23

26. mmcl2003 25 What is the shape of the HCl molecule ? linear answer 24

27. mmcl2003 26 Which type of elements are involved in ionic bonding? Metals with non-metals answer 25

28. mmcl2003 27 How is an ionic bond formed ? Transfer of electrons from the metal atom to the non-metal atom. answer 26

29. mmcl2003 28 How do metals form ions ? Metal atoms lose outer electrons to form +ve ions answer 27

30. mmcl2003 29 How do non-metals form ions ? Non-metal atoms gain electrons to fill outer orbitals (energy level) to form -ve ions answer 28

31. mmcl2003 30 What information is give by the Roman Numeral in the formula of a compound containing a Transition metal? The valency (combining power) of the Transition metal answer 29