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Boron Family (13)

- do not occur elementally in nature

- are scarce in nature (except aluminum, which is the most abundant metallic element)

- have three valence electrons

- are metallic (except boron, which is a solid metalloid)

- are soft and have low melting points (except boron, which is hard and has a high melting point)

- are chemically reactive at moderate temperatures (except boron)

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Q: What properties does boron and boron family share?
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