is an isotope of noble gas radon . how many protons,neutrons&electrons are present in 1 atom isotope of radon?


The general representation of an element is 


where X is the symbol of the element, Z is its atomic number and A is its mass number. We are given that for radon, the atomic number is 86 and the mass number is 222. In a neutral atom

atomic number = number of protons = number of electrons 

Thus, in radon, the number of protons and electrons is 86. Since 

mass number = number of protons + number of neutrons

therefore, if 222 is the mass number, then number of neutrons = mass number - number of protons 

= 222 - 86 

= 136

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