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23-10-2016
Chemistry

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The atomic number of the atom which does not usually form compounds is: 16 17 18 19 20

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JoshEast JoshEast

23-10-2016

The best answer is 18 because with an atomic number of 18, it would mean that the element has an octet (full) on the third shell.

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23-10-2016

It is 18, because it has already it's octet completed....

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