Question

the total number of electrons and protons in an atom of an element is 184. If the mass number of the atom is 235, calculate the numbers of neutrons in it.​

Answer 1

Mass number is the total of neutrons and protons

electrons have negligible mass

So no of protons is 184

Therefore no. of neutrons = 235 - 184

= 51 neutrons

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Answer 2

Answer:

The number of neutrons in an atom of a given element is equal to 143.

Explanation:

Given, the sum of the number of electrons and number of protons is equal to 184.

Electrons + Protons = 184

We know that, in an atom the number of electrons is equal to number of protons.

Therefore, 2 (Protons) = 184

Number of protons $=\frac{184}{2}=92$

We know that the mass number of an atom is the sum of the number of protons as well as number of neutrons in that atom.

Therefore, number of $neutrons$ + number of $protons$ $= 235$

Number of neutrons + 92 = 235

Number of neutrons $= 235 - 92$

Number of neutrons  = 143

Therefore, the number of neutrons in an atom of a given element is equal to 143.

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