sissanijirkdon sissanijirkdon
  • 23-10-2016
  • Chemistry
contestada

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

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JoshEast
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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SJ2006
SJ2006 SJ2006
  • 23-10-2016
It is 18, because it has already it's octet completed....
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