atomic number 69

(Pronunciation -تلفظ سنیۓ ) US:

Slow

Normal

Noun: atomic number 69

1. atomic number 69 [ Synonyms: thulium, tm]
A soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime

Generic Words:

metal, metallic element

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