Magnesium has lower melting point even though it has higher number of unpaired electron for bonding
Answers
Well, It is very common question in the minds of all good chemistry students. Firstly it should be understood that this is an anomaly. And anomalies in chemistry are reasoned by other factors. It can be understood by..
Melting point depends on extent metallic bonding, and the idea about metallic bonding can be understood by enthalpy of atomization values.If u look at values, Mn has lower value among other elements of the period.
The other reason is very obvious, the half filled d orbital electrons are very tightly bound to the nucleus. Thus these 5 d electrons are very less delocalised and can not help in effective metallic bonding.Therefore, Mn has less melting point inspite of having 5 unpaired d electrons.
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Answer:
Manganese has lower melting point than its neighbouring elements as it has higher bond strength. As the number of unpaired electron increases, the strength of metallic bond, between two metal atoms increases, which leads to increase in melting point of the metals and their enthalpy of atomization.