Explain: There occurs much more frequent metal-metal bonding in compounds of heavy transition metals(i.e third series)
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The transition metals are usually very hard and have low volatility with high melting and boiling points.
This high melting points contributes in greater number of electrons from (n-1)d in addition to the ns electrons in the inter atomic metallic bonding.
They also have high enthalpies of atomisation. In general, greater the number of valence electrons, stronger is the resultant bonding. So metals with very high enthalpy of atomisation tend to be noble in their reactions.
And 2nd and 3rd series have the higher enthalpies
This high melting points contributes in greater number of electrons from (n-1)d in addition to the ns electrons in the inter atomic metallic bonding.
They also have high enthalpies of atomisation. In general, greater the number of valence electrons, stronger is the resultant bonding. So metals with very high enthalpy of atomisation tend to be noble in their reactions.
And 2nd and 3rd series have the higher enthalpies
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