| Explain the physical properties of group one metals | - They are soft
- Have relatively low melting points
- Have relatively low densities |
| How do group 1 metals react with oxygen/chlorine? | - React rapidly with oxygen/chlorine- as we move down group 1 the elements react more rapidly |
| Why are group 1 metals more reactive as we move down it? | - When we move down group 1, the outer electron is less attracted to the nucleus and easier to lose
- Because there's a greater distance between the positive nucleus and the negative outer electron
- Secondly, the outer electron is shielded from the nucleus by the internal energy levels |
| Why are group 7 elements in pairs (O2, F2...)? | They have 7 electrons on their outer shells, so they covalently bond in pairs forming molecules - no overall charge |
| How do halogens produce non-metal compounds? | By bonding covalently with other non-metals |
| How are ionic compounds formed? | Group 7 elements, reacting with metals |
| What happens to the reactivity of Group 7 elements as you move down and why? | - Elements get less reactive as we move down Group 7
- Because as you move down, the elements have a greater distance between the outer energy level and the nucleus
- As you move down the outer energy levels become more shielded from the + charge of the nucleus by the internal electrons
- These factors reduce the attraction between the outer electrons and the nucleus, making it harder to attract an electron into its outer energy level |
| Explain how a Group 7 element can displace another | A more reactive halogen can displace a less reactive one from an aqueous solution of its salts
EG: Potassium iodide (aq) + chlorine -> potassium chloride + iodine
- here chlorine displaces iodine as it is more reactive |
