Question

What are the protons, neutrons and electrons for $ Sulphur{{r}^{2-}} $ anion with a mass number of $ 33 $ ?

Answer 1

Hint :The atom is composed of protons, neutrons and the electrons. The electrons have the negative charge on them while the protons have the positive charge on them and the neutrons are neutral in nature with no charge. The mass number of the atom is also known as the atomic mass number which is the sum of the number of protons and number of neutrons present in the atom.

Complete Step By Step Answer:
The mass number is equal to the total number of nucleons. The mass number is approximately equal to the atomic mass of the atom which has been expressed in Dalton. The protons and neutrons are referred to as baryons. So the total mass number A is equal to the sum of the number of protons and number of neutrons. The number of the proton is equal to the atomic number. The symbol to represent the atomic number or the number of protons is Z. so the relationship between the mass number and the protons and neutrons is the following: $ N=A-Z $
The number of protons is easy. It's sulfur, $ Z\text{ }=\text{ }16 $ , so there are $ 16 $ if there are $ 16 $ positively charged particles, there must be $ 16 $ negatively charged particles in the neutral element. We have $ {{S}^{2-}} $ , and thus there must be 18 electrons associated with the ion.
And neutrons for $ {}^{33}S $ well, the electrons are along for the ride, and have zero rest mass. The mass of an atom, to a first approximation, is the number of massive, nuclear particles, i.e. the number of protons and neutrons. We have $ 16 $ nuclear protons, so there must be $ 17 $ neutrons,
 $ {{33}_{the\text{ }mass\text{ }number}}={{16}_{protons}}+{{17}_{neutrons}}. $

Note :
Note that the number of protons, atomic number and the number of electrons are equal. The mass number and the atomic number are always present as the whole number as they are obtained by counting the total number of protons, neutrons and the electrons. We know that the protons and neutrons are combined in nucleus so they are known as nucleons.