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The number 85 after krypton is theatomic weightwhich tells you how many protons and neutrons are in the nucleus.The atomic number tells you the number of protons in the nucleus,kryptons atomic number is 36, so thereare 36 protons. To find neutrons subtract the number of protons from the atomic weight, 85 - 36 = 49 neutrons.

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15y ago
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13y ago

Krypton has 36 protons and 78-36 = 42 neutrons.

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13y ago

All krypton atoms have 36 protons, regardless of the isotope.

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12y ago

Krypton is atomic number 36 and there would thus be 36 protons no matter what isotope. This particular isotope would have 80-36 = 44 neutrons also.

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13y ago

protons 36

neutrons 42

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12y ago

36 protons, 49 neutrons

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Q: How many protons an neutrons make up an atom of Krypton-78?
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