Which of the following is not a property of lanthanides?(a) They are soft metals with white silvery color(b) They tarnish rapidly by air(c) The hardness of the metals increases with increase in the atomic number(d) The melting point of the metal ranges from 500-1000KThis question was posed to me by my school principal while I was bunking the class.Question is from D and F-Block Elements topic in portion D and F-Block Elements of Chemistry – Class 12

Which of the following is not a property of lanthanides?(a) They are s

1.	Which of the following is not a property of lanthanides?(a) They are soft metals with white silvery color(b) They tarnish rapidly by air(c) The hardness of the metals increases with increase in the atomic number(d) The melting point of the metal ranges from 500-1000KThis question was posed to me by my school principal while I was bunking the class.Question is from D and F-Block Elements topic in portion D and F-Block Elements of Chemistry – Class 12
Answer» Correct OPTION is (d) The melting point of the metal ranges from 500-1000K Easiest explanation: All lanthanides are soft metals with SILVERY white color. They tarnish rapidly by air. With INCREASE in atomic number, the harness of these metals also INCREASES. The melting points of the lanthanides ranges from 1000 to 1200K but SAMARIUM melts at 1623K.

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