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The most difficult isotopes riddles

A list of isotopes related questions that are most often answered incorrectly
Chemistry quiz
What is the name of the most radioactive isotope on the planet?
Rad 226
Uranus 235
Polonium 210
plutonium 244
210Po is extremely toxic, with one microgram being enough to kill the average adult (250,000 times more toxic than hydrogen cyanide by weight). 210Po was used to kill Russian dissident and ex-FSB officer Alexander V. Litvinenko in 2006.
 Ts
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wikipedia → Polonium
6
Very interesting!
chemical elements riddles
How many hydrogen isotopes occur naturally on the Earth?
one
two
three
four
Three isotopes of hydrogen occur naturally on the Earth: the most frequent protium (1H), deuterium (2H) and tritium (3H). Other isotopes of hydrogen (4H-7H) were created in laboratories and are highly unstable.
 Paweł Kołodziejczyk
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wikipedia → Category:Isotopes of hydrogen
3
Very interesting!
hydrogen riddles
Which of the following is not a hydrogen isotope?
tritium
protium
iridium
deuterium
Protium, deuterium and tritium are hydrogen isotope varieties. Iridium is a chemical element.
 globalquiz.org
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0
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2
Very interesting!
elements riddles
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Chemistry quiz