IGCSE Chemistry: Periodic Trends Down Groups 1 & 7

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In this video we look into the IGCSE periodic trends, focusing specifically on trends down groups 1 and 7.
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Great video. But I have one doubt. So as you go down, both group one and group 7, atomic radius increases and attraction between nucleus and outer electrons decreases. Then why does melting point decrease for group 1 but increase for group 7 as you go down the group?

The.life-long.learner