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Look at the valance number at the top of every family of elements. For example; looking at column 4A, the carbon family, I see 4 valance electrons signified. This means that 4 electrons are needed to fill the outer shell to the octet state. So I know that carbon can form 4 covalent bonds.

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13y ago
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Q: How does ones kow how many covalent bonds a particular atom will form?
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