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Judith Simpson
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Trina Garrison
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Describe and explain the trend in boiling and melting points going across period 3.
Across the metals (Na, Mg, Al) MP and BP increase as the number of delocalised electrons increases, making metallic bonding stronger. Si has a high MP and BP due to its giant covalent structure. In the non-metals with simple molecular structures, MP and BP are dependent on the size of the molecule: the greater the molecular surface area, the stronger the van der Waals forces between molecules, so the higher the MP and BP.
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