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2016-02-27T08:38:41+05:30
Two properties of the elements belonging to the first group of the modern periodic table are-1.They all are metals
2.All of them have valency one.
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2016-02-27T09:48:11+05:30
They have one valence electron. Their valency is one. They all are alkali metals(except for hydrogen). They all are good reducing agents as well.
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