7. Which of the following is not a lanthanide property? a) They are soft metals with white silvery colour 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 500-1000K
Lanthanides share the following common properties: Silvery-white metals that tarnish when exposed to air, forming their oxides. Relatively soft metals. ... Moving from left to right across the period (increasing atomic number), the radius of each lanthanide 3+ ion steadily decreases. ... High melting points and boiling points.
