Inorganic Chemistry> melting point of magneze...

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?

vikash chandoa , 15 Years ago

Grade 12

9 Answers

SAGAR SINGH - IIT DELHI

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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Sagar Singh
B.Tech, IIT Delhi

Last Activity: 15 Years ago

Sumanth

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??

Last Activity: 9 Years ago

rajesh kumar sahu

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.

Last Activity: 8 Years ago

shreya

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??

Last Activity: 8 Years ago

abirami menath

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

Last Activity: 8 Years ago

Yadu krishnan

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.

Last Activity: 7 Years ago

Taha Umrethwala

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.

Last Activity: 7 Years ago

Rishi Sharma

Dear Student,
Please find below the solution to your problem.

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.

Thanks and Regards

Last Activity: 5 Years ago

John Paul Hilson

Generally, transition elements have high melting and boiling point due to high enthalpy of atomization but for Manganese the melting point is low because it has low enthalpy of atomization. Low enthalpy of atomization is due to 3d⁵ electrons which is held tight by the nucleus and hence weakening metallic bond, since the bond is weak the energy needed to became individual atom(low enthalpy of atomization) is less and hence the melting and also the boiling bond is less.

Last Activity: 5 Years ago