How many valence electrons does Li have?

Answer:

 Lithium has one valence electron.

Explanation:

To find out the number of valence electrons in a Li atom,we need to look at the periodic table.

The position of Li in the periodic table  is in group 1A.For main group elements,valence electrons are equal to the group number.So a lithium atom has one valence electron in its valence shell.

Again,Li is an element of group 1.Now just consider the unit place digit from group number.You are getting 1 which is equal to the number of valence electron in lithium.

Here is the another way to find out the valence electrons of Li.

The atomic number of Li is 3.So it has three electrons totally.

Now write the electronic configuration of Li.

Li(3) =1s2 2s1

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 2.So,the valence shell of lithium is the 2nd shell.

In 2nd shell we get 1 valence electron.So  each Li has one valence electron.

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