Respuesta :

The correct answer is:  "3 (THREE)" .
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  "HONC " 
   1  2 3 4
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In which "H" is the symbol for the element "hydrogen" ; 
               "O" is the symbol for the element "oxygen" ;
               "N" is the symbol for the element "nitrogen" ;
               "C" is the symbol for the element "carbon"
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And the number of bonds formed:  

1, (for "H"); 2 (for "O"); 3 (for "N");  and 4 (for "C") .
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