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11 March, 03:57

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

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Answers (2)
  1. 11 March, 05:30
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    It is 18, because it has already it's octet completed ...
  2. 11 March, 05:59
    0
    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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