# How many neutrons are in an atom of #"_86^222Rn#?

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

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An atom of (^{222}_{86}\text{Rn}) has 136 neutrons.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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