State how elements are arranged in the PT.
What can we deduce from the Group No. & Period No.?
- arranged in order of ascending atomic number
Group No. = no. of valence electrons
Period No. = no. of occupied shells
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State the properties of Group I elements (alkali metals).
- *low mp
- low density
- soft
- react vigourously with water to form alkali (metal hydroxides) + hydrogen gas
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State the trend for the properties down Group I.
- mp decrease
- reactivity increase
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State the properties of Group VII elements (halogens).
- low mp/bp
- coloured
- react readily with sodium to form halides
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State the trend for the properties down Group VII.
- mp/bp increase
- reactivity decrease
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State the properties of Group 0 elements (noble gases).
- low mp/bp
- inert (do not undergo reactions)
- monoatomic
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State the properties of transition elements (TE).
- high mp
- high density
- form ions with different charges
- form coloured compounds
- TE and compounds are good catalysts
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