Question

How many total electrons are there in a Ni2+ ion?
also how many protons are in an ion with 18 electrons and a -1 charge?

Answer 1

The atomic number of an element equals the number of electrons in that element. In an atom, the number of electrons (negative charge) is always equal to the number of protons (positive charge). This is the reason that the atom as a whole is always neutral.

For any charged species, the total number of electrons depends upon the nature of the charge if it is positive or negative. For positive charge, number electrons are subtracted from atomic number equals the magnitude of charge, and for a negative charge, electrons are added to atomic number.

Atomic number of Nickel is 28. It is represented by symbol${\rm{Ni}}$. Therefore, number of electrons will be $28$. ${\rm{N}}{{\rm{i}}^{{\rm{ + 2}}}}$ has two positive charges. So, two electrons are removed from it and thus, the total number of electrons would be$26$.

There are$18$electrons in the atom. Therefore, the number of protons will be$18$. There is $1$ negative charge. So, the number of protons will be$17$.

Ans:

The number of electrons in the${\rm{N}}{{\rm{i}}^{{\rm{ + 2}}}}$ is $26$.

The number of protons are 17.