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Grade: 12
        
Why manganese (Mn) has lower melting point than that of its neighborhood elements? Manganese has 5 free electrons in its d orbital so it take place more in metallic bonding as compared to other elements in its neighborhood (left and right in periodic table) who have 4 free electrons in their d orbital. More metallic bonding means more energy requires in breaking bond and more melting point but it is not so can you please tell me why?
8 years ago

Answers : (7)

SAGAR SINGH - IIT DELHI
879 Points
							Dear student,
Manganese has 5 free electrons in its d orbital so it take place more in metallic bonding as compared to other elements in its neighborhood (left and right in periodic table) who have 4 free electrons in their d orbital. More metallic bonding means more energy requires in breaking bond and more melting point.
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Askiitians Expert
Sagar Singh
B.Tech, IIT Delhi
8 years ago
Sumanth
36 Points
							
Manganese has 5 electrons in its d-orbital . This is a half filled stable configuration. Hence these electrons are not free to participate in metallic bonding. That is why Mn has unusually low M.P. Was this answer helpful??
2 years ago
rajesh kumar sahu
11 Points
							
if the configuration is half filled, the it should pair up with another half filled orbital to give very strong metallic bonding and thus provide high melting point. i think the reason is something else.
2 years ago
shreya
11 Points
							Actually the reason is that there is however more gap btwn mn atoms than other elements of 3d series thus there is already gap n it needs less energy..Helpful??
						
2 years ago
abirami menath
21 Points
							
Mn has 3d5 which make it extra stable due to its half filled configeration. so it doesn’t require to take part in metallic bonding further. hence Mn has low melting point
 
one year ago
Yadu krishnan
11 Points
							Actually,melting point depends not only on number of unpaired electrons but also on the heat of atomization.,that is .enthalpy change when it breaks into its constituent atoms.Manganese has less heat of atomization and hence its melting point is also low.
						
one year ago
Taha Umrethwala
15 Points
							
Fe, Ni and Co exhibit ferromagnetism which results in a very high net magnetic moment, thus even though no of unpaired electrons decrease the effect is very well made up due to its magnetism. All in all, metallic bonding is much stronger.    the metals that follow techtenium however don't exhibit ferromagnetism, thus the regular trend of lowered melting point is observed
Oh, and incase u were wondering, Fe,Ni,Co exhibit ferromagnetism due to their specific domain structure.
 
10 months ago
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