Question

How many electrons does manganese have?

Answer 1

Hint The answer here is based on the facts about the general concepts of chemistry which says that number of protons is equal to electrons and by finding the number of protons based on the atomic number which gives the required answer.

Complete step – by – step answer:
In the lower classes of chemistry, we have studied the concepts of general chemistry which deals with the fact about the structure of the atom and its constituent parts that is the nucleus which is composed of protons and neutrons and the electrons revolve around it.
We shall now see how to count the number of electrons that are present in an atom.
- Manganese has an atomic number of 25 and atomic symbol $Mn$ and therefore the electronic configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}4s^2$ .
- Here, the atomic number represents the total number of protons.
- Since we know that the total number of protons is always equal to the number of electrons, the total number of electrons present in manganese is 25.
- Here, in the electronic configuration the number represents the number of electrons and the name electronic configuration itself says it is the configuration of number of electrons present in an atom.

Therefore, the correct answer is that there are 25 electrons in manganese atoms.

Note: Note that the electronic configuration of an atom having more number of electrons can be written in the form of shorthand notations where the valence electrons are written outside the brackets preceded by its respective noble gas. For manganese, it can be written as, $[Ar]3d^{5}4s^2$ .