How Many Valence Electrons Does Magnesium Have?

Answer:

Magnesium has two valence electrons.

Explanation:

Now I am going to show you how many  valence electrons  magnesium have in just 5 steps.

             Step-1:

First, find the atomic number of magnesium from periodic table.

From periodic table ,we see that the atomic number of magnesium is 12.

                 Step-2:

We know that the atomic number of magnesium is 12.So magnesium has 12 protons and 12 electrons as the charge of electrons and protons are equal but opposite in nature.The charge of proton is +1 and the charge of electron is -1.

                Step-3:

Now write the electron configuration of magnesium .

Mg(12)=1s²2s²2p⁶3s²

                Step-4:

Mg(12)=1s²2s²2p⁶3s²

Now we will find out valence shell of magnesium from the electronic configuration of  magnesium.

Mg(12)=1s²2s²2p⁶3s²

Valence shell can be found from the highest number of principal quantum number.

You know that principal quantum number is expressed by n.

Mg(12)=1s²2s²2p⁶3s²

Here the highest value of n is 3.SoThe valence shell of magnesium is 3s²

                 Step-5

In this step,we will find out the valence electrons of magnesium.

We have to know that the electrons of valence shell are called valence electrons.

Mg(12)=1s²2s²2p⁶3s²

From the above electron 

configuration 

of magnesium,we see 

that magnesium has 2 

valence electrons in its 

valence shell(3s²).

So there are two valence electrons of magnesium.

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