How many protons, neutrons, and electrons are there if manganese has an atomic number of 25, a mass number of 55, and a charge of +6?

Mn has 25 protons. 

Normally, it would also have 25 electrons. However, a charge of +6 indicates that it has 6 less electrons. Thus, this ion has 19 electrons. 

The number of neutrons is the mass number-the number of protons = 30 neutrons. 

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Answer : option a) 84explanation :

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.