thorium sentence - thorium sentence in Hindi (11-20)

	11.	It is an area of concentrated thorium, a radioactive element.
	12.	Among the actinides, thorium and uranium are the easiest to isolate.
	13.	As a result, thorium salts have a weak tendency to hydrolyse.
	14.	Small addition of fluoride ions catalyses dissolution of thorium dioxide in acids.
	15.	Thorium precipitates out of solution as hydroxide and is removed.
	16.	Thorium is weakly radioactive : all of its known isotopes are unstable.
	17.	Thorium only occurs as a minor constituent of most minerals.
	18.	Half of this thorium produced is used in gas mantles.
	19.	Thorium tetrafluoride is used as an antireflection material in multilayered optical coatings.
	20.	Because of their uranium and thorium content, some zircons undergo metamictization.

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