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4 Cards in this Set
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What are the properties of the group 1 metals? |
They are very reactive and must be stored in oil to step them reacting with oxygen. The reactivity increases as we go down the group. They have a very low density. The first three (lithium, sodium, and potassium) float on water. They can be cut with a knife and have a silvery shiny surface which goes dull as it reacts with oxygen. It forms a layer of oxide. They react with non metals to form a metal ion with 1+ charge. They always form ionic compounds which are white solids that dissolve in water to form colourless, alkaline solutions. They react with water to form hydrogen and a metal hydroxide. Lithium, sodium, and potassium fizz and float on the water, producing hydrogen. Potassium burns with a lilac flame. |
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What are the properties of the transition metals? |
They usually have higher melting points. They are stronger and harder. They are less reactive. They are good conductors. They are hard and strong. They have high densities. |
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What are the properties of the halogens? |
The further down the periodic table, the less reactive the element and the higher the melting and boiling points. They are poor conductors of heat and electricity. |
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How are halogens displaced? |
A more reactive halogen can replace a less reactive halogen from the solution of its salts. For example, chlorine + potassium bromide --> potassium chloride + bromine |
