Choose the correct statement(s) regarding characteristics of lanthanides :

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Hardness increases with mer-easing atomic number, samarium being steel hard

They have typical metallic structure and are good conductors of beat and electricity

Their M.P. range between 1000 to 1200 K but samarium melts at 1623 K

They are silvery white soft metals and tarnish rapidly in air

answer is A, B, C, D.

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Detailed Solution

All lanthanoids are soft, silvery metals that tarnish quickly in air. Samarium is steel hard, and hardness rises with increasing atomic number. Samarium melts at 1623 K while the other metals' melting temperatures range from 1000 to 1200 K. They are effective heat and electricity conductors and have a typical metallic structure.
In solid state, lanthanoids' hardness rises as size falls and packing gets more dense.
Samarium melts at 1623 K while the other metals' melting temperatures range from 1000 to 1200 K. They are effective heat and electricity conductors and have a typical metallic structure.

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