How many valence electrons does magnesium have?
Answer:
Magnesium has two valence electrons.
Explanation:
To find out the number of valence electrons in a magnesium atom,we need to look at the periodic table.
The position of magnesium in the periodic table is in group IIA.For main group elements,valence electrons are equal to the group number.So,magnesium atom has two valence electrons in its valence shell.
Magnesium is an element of group 2.Now just consider the unit place digit from group number.You are getting 2 which is equal to the number of valence electrons in magnesium.
Here is the another way to find out the valence electrons of magnesium.
The symbol of sodium is Mg and the atomic number of magnesium is 12.So, it has twelve electrons totally.
Now do the electronic configuration of magnesium.
Mg(12) =1s2 2s2 2p6 3s2
=[Ne] 3s2
The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons.
The valence shell or energy level can be identified by the highest value of principal quantum number ,n.Here the highest value of n is 3.So,the valence shell is the 3rd shell.
In 3rd shell we get two valence electrons.So each magnesium has two valence electrons.
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