Which group 1 element exhibits slightly different chemistry from the others?
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The group 1 element that exhibits slightly different chemistry from the others is: Lithium (Li).

The chemical elements found in group 1 of the periodic table are highly electro positive metals and have a single (1) valence electron in its outermost shell.

Some examples of these chemical elements (alkali metals) are;

Li is the symbol for the chemical element referred to as Lithium.

Lithium (Li) is an alkali metal and as such it is found in group 1 of the periodic table with a single (1) valence electron in its outermost shell.

Also, the electronic configuration of Lithium (Li) is written as;

As a result of the small size of Lithium (Li), it is exhibits slightly different chemistry from the others such as:

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since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.