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Boron (B) is the fifth element in the periodic table. It has two electrons in the first energy level and three electrons in the second energy level.
The electrons in the second energy level are called valence electrons and can form bonds with other elements to make compounds.
Because there are only three valence electrons Boron forms three bonds with other elements.
An example is BH3, boron trihydride. BF3, boron triflouride, is another example.
The electron boron can form 3 bonds.
Boron can form three bonds
Boron can form three bonds because it is the 5th element on the periodic table therefore it has 3 valence electrons which can be used to bond.
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