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Q.

${Rn}_{86}^{222}$ is an isotope of noble gas Radon. The number of protons, neutrons and electrons present in it are

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a

86;86;136

b

86;136;86

c

136;86;86

answer is C.

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Detailed Solution

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{Rn}_{86}^{222}

is an isotope of noble gas Radon. The number of protons, neutrons and electrons present in it are 86, 136 and 86 respectively.
Given are the atomic number of Rn = 86, mass number of Rn = 222
We know that number of protons is = 86
Number of electrons = Number of protons

\Rightarrow 86

Number of neutrons = (Mass Number) - (Atomic Number)

\Rightarrow 222 - 86

\Rightarrow 136

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