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➤ The use of lasers to remove calculi in the ureters and bladder is an effective treatment for urolithiasis.

➤ They are considered to be high-quality MRI contrast agents that improve diagnostic studies of visceral organs.

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➤ Severe intoxication can lead to nephropathy and CNS disorders, allergic reactions to the skin, eyes and respiratory tract, and adversely affect kidney and liver function.

➤ There is no specific antidote.

➤ The methods of liquid extraction and ion exchange produce holmium oxide with a purity of 99.99%.

➤ Ho compounds are yellow in colour.

➤ Ho is an ideal paramagnetic.

➤ One isotope is known ¹⁶⁵Ho.