The average atomic mass recorded on the periodic table for krypton is 83.80 u. This indicates that the most abundant isotope of krypton is (2 points) krypton-82 krypton-83 krypton-84 krypton-85

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12-06-2018
Chemistry

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The average atomic mass recorded on the periodic table for krypton is 83.80 u. This indicates that the most abundant isotope of krypton is (2 points) krypton-82 krypton-83 krypton-84 krypton-85

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Dejanras Dejanras · Answer 1 · 2018-06-21T23:43:04+02:00

Answer is: krypton-84.

Isotopes are chemical elements with same atomic number, but different atomic mass (different number of neutrons).
The average atomic mass of krypton =
= ω(⁸²Kr) · Ar(⁸²Kr) + ω(⁸³Kr)·Ar(⁸³Kr) + ω(⁸⁴Kr) · Ar(⁸⁴Kr) + ω(⁸⁵Kr)· Ar(⁸⁵Kr).
ω(Kr) is average abundance of isotopes of krypton.
Ar(Kr) is atomic mass of krypton isotope.
Average atomic mass of krypton is closest to Kr-84.