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Chemical Bonding: No. of electrons in outermost orbit Bond Order
20 0.0
19 0.5
18 1
17 1.5
16 2
15 2.5
14 3
13 2.5
12 2.0
11 1.5
10 1.0
9 0.5
8 0
Magnetic Property: Remember "DEPO"
D - Diamagnetic if Even no of electron
P-Paramagnetic if odd no of electron
i.e Dia if Even Para if Odd = = DEPO
Example:
One negative charge will add one electron and one positive will subtract one electron.
CN- , N0+ N0- CO CN CO+ O2+ O2-
CN- = 6 + 7 + 1 = 14 ...B.O = 3 and no of electron are even so Diamagnetic in nature
NO+ = 7 + 8 - 1 = 14 ...B.O = 3 and no of electrons are even(14) so diamagnetic in nature
NO- = 7 + 8 + 1 = 16 B,O = 2 and again Dia in nature
CO = 6 + 8 = 14 B.O= 3 again diamagnetic in nature ( 14 e and is even)
O2+ = 2(8) - 1 = 15 B.O = 2.5 and is paramagnetic in nature ..coz odd no of electron ( 15 is odd)
O2- = 2(8) + 1 = 17 B.O = 1.5 and is paramagnetic in nature ..
CO+ = 6 + 8 - 1 = 13 B.O = 2.5 ....and is paramagnetic in nature due to odd no of electrons ( 13 electron)
EXCEPTION: O2 and B2
O2 = 16 electron and B2 = 10 electron ....both have even no of electron but then also they are PARAMAGNETIC in nature...
Just remember these two exception and apply it for others ..
Solve for : N2+ N2- CN NO+ NO- ....and go through previous year question on B.O .....
All the mentioned compounds have been asked in JEE many times...
Comment ...on this..if u are unable to understand or any question ?
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