How many neutrons are in an atom of 22286Rn?

1 Answer
reudhreghs
Mar 5, 2017

136

Explanation:

The 22286Rn atom has a mass number (at the top) of 222 and an atomic number (at the bottom) of 86.

The mass number is the number of protons and the number of neutrons, each with mass of 1, added together. The atomic number is just the number of protons.

Therefore, we can find out the number of neutrons by simply subtracting the two:

222−86=136 neutrons.

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