The atomic number of magnesium mg is 12. the symbol for a magnesium ion is mg2+. deduce the number of electrons in a magnesium ion 12 =

The number of electrons in Magnesium ion is 10.

Explanation:

Given element is Magnesium whose atomic number is 12.

The atomic number of an element  tells the number of electrons in a neutral atom of the element. So the number of electron is also 12.

Now we will find out the electron configuration for Mg,

Electron configuration for Mg =

That means the number of electrons for K,L,M shell is 2,8,2.

Any element gain or lose electrons and forms ion to become stable. In case of Magnesium there are 2 electrons in its outer most shell, so it loses 2 electrons and forms Magnesium ion.

Number of electrons in Magnesium ion = Number of electrons in Magnesium atom - Number of losed electrons

Number of electrons in Magnesium ion =

Hence the number of electrons in Magnesium ion is 10.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

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