What is 84 in Krypton-84?

Answer 1

The 84 is the number of protons and neutrons (nucleons) in the atomic nucleus of the isotope krypton-84. . As Kr has an atomic number of 36, the number of protons is 36, and in krypton -84 there are therefore 48 neutrons.

Answer 2

The 84 in Krypton, which is actually closer to 83.8), is the Atomic Mass. This is a number that allows one to track the number of atoms of krypton in a given amount of krypton or a substance containing it. The 83.8 means that in 83.8 GRAMS of pure Krypton, there is exactly one MOLE of Krypton. One mole is defined as being EXACTLY 2.2214179X10^23 atoms (Avogadro's number) of Krypton. That means, if we have something like 20 grams of Krypton, we can 'count' the molecules in this chunk of Krypton like this: (20grams Kr)(1Mol Kr / 83.8 grams) = 0.2386634845 moles of Krypton. From here, we multiply the number of moles by Avogadro's number, and we get: (0.2386634845 moles Kr)(2.2214179X10^23 atoms / mol) = 5.301713365X10^22 atoms of Kr in 20 grams of Kr.

Answer 3

84 is the mass number of a stable isotope of krypton, 84Kr has 36 protons and 48 neutrons in its nucleus that give it an atomic weight of 84.

Answer 4

84 stands for the mass number (number of protons + number of neutrons)

Answer 5

Krypton 84 is mass number