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Old Sep 8th 2017, 07:39 AM   #1
shenno
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chemistry

i am confused with charge and valency of some formula.

for carbon dioxide CO oxygen has a charge of -2 and carbon has a charge of +2. I thought though carbon is in 4 so its charge should be +/- 4.


for nitrogen monoxide NO oxygen has a charge of 2- usually and nitrogen usually has a charge of -3 so this makes no sense to me as the charge is supposed to balance of the compound and both atoms want to gain electrons which also does not make sense to me.

i have the same problems with dinitrogen tetroxide, nitrogen dioxide,sulfur dioxide, sulphur trioxide, and phosphorous(v) chloride. how are you supposed to know the formula and for these if they all have random charges and do not follow the rules? do you just learn them off?
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Old Sep 23rd 2017, 06:26 AM   #2
chemtopper
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You need to practice oxidation number rules.Most of the elements do not show charges on them same as group number or number of electrons needed to complete the octet.
Carbon can show from -4 to +4 means -4,-2,0,+2,+4
CCl4 , CHCl3, CH2Cl2, CH3Cl , CH4
ON of C +4 +2 0 -2 -4
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