Electronic configuration of molecular orbital diagrams for NB
Answers
Answer:
It is defined as the number of covalent bonds between the two combining atoms of a molecule.
Bond order = 0.5 (Nb – Na)
Nb = number of bonding electrons or number of electrons in bonding M.O’s
Na = number of antibonding electrons
2) Stability of molecule :
It is determined by bond order.Higher is the bond order greater is the stability of molecule.
i) If Nb > Na, then molecule will be stable.
ii) If Nb=Na, then formation of the molecule will not take place.
iii) If Nb< Na, then molecule will be unstable.
3) Magnetic property :
A molecule in which all the electrons are paired, is called diamagnetic while molecule which has one or more unpaired electron is called paramagnetic.
Molecular orbital diagram of H2 (Hydrogen molecule) :
Number of electrons in H2 = 2
Electronic configuration of H2 = σ1s2
Bond order = 0.5 (Nb-Na)
Nb=2
Na=0
B.O = 0.5 (2-0)
B.O= 1
M.O. diagram of He2 molecule :
2He = 1s2
Electronic configuration of He2 = σ1s2, σ*1s2
Nb =2, Na=2
B.O =0.5(0-0)
B.O=0 (Zero)
Molecules having zero bond order do not exist.
Molecular orbital diagram of H2+ (Hydrogen molecule ion) :
H2+ = σ1s1
B.O =0.5 (Nb- Na)
Nb =1 , Na = 0
B.O = 0.5(1-0)
B.O =0.5