Valence electrons are important because

a) they form chemical bonds with other atoms

b) they tell which period the element is in

c) they take isotopes

d) they identify the element

AS FAR AS I AM CONCERNED IT'S TO MAKE BONDS WITH OTHER ELEMENTS.

Explanation:

ATOMS MAKE A BOND WITH OTHERS WITH THE HELP OF ELECTRONS.

FOR INSTANCE SODIUM CHLORIDE.

THE SODIUM ATOM LOSES ONE ELECTRON TO CHLORINE .CHLORINE AS WELL GAINS ONE ELECTION FROM SODIUM. THUS SODIUM CHLORIDE IS FORMED.

the organisms are not adapted to live in some communities or habitats.

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