Answer :


The elements with yellow boxes are rare earth metals.


Some information on rare earth metals:


i. They are silvery white soft metals.


ii. They are good conductors of heat and electricity.


iii. They have high melting point.


iv. They are used in the glass industries for polishing glass.


v. They give protection against UV light.


vi. They are used in making magnetic and electronic devices.


vii. They are quite reactive.


viii. They readily lose electrons and are thus good reducing agents.


ix. They have low ionization enthalpies.


x. They are used in making bullets and shells.


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