Elements With Near-Perfect Atomic Weight

Name the elements whose atomic mass ends with .00 if rounded to the nearest hundredth.

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Last updated: April 20, 2026

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First submitted	April 20, 2026
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Weight	Answer
4	Helium
16	Oxygen
19	Flourine
52	Chromium

Weight	Answer
98	Technetium
222	Radon
226	Radium

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2 Comments

Level 39

Apr 20, 2026

Atomic Mass is essentially a measure of the average of the different isotopes of a specific element. Therefore while some periodic tables round to cool round numbers they are not exactly exact as in all the combinations with that number of protons its a very slim probobilty they would round out to a round number. Oxygen for instance on my periodic table is listed as 15.999. So I would say exact is not the word for it.

Level 67

Apr 20, 2026

Yes, but I did say to round the number in the description so that it would make more sense. If not for that, then I wouldn't be able to make this quiz.

What do you suggest I change 'exact' to?