Compounds and Their Bonds. Part II: Covalent Bonding. Covalent Bonds. Covalent Bonds. Which elements on the periodic table have a strong pull on electrons?. Covalent Bonds. Covalent: “ Co -ownership of valence electrons”
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Cl2 CO2 H2O
NH3 HCl CH4
How will two chlorine atoms react?
Each chlorine atom wants to gain one electron to achieve an octet
Neither atom will give up an electron –
chlorine is highly electronegative.
What’s the solution?
What can they do to achieve an octet?
This forms an octet
So does this
This is the bonding pair
It is called aSINGLE BOND
Single bonds are abbreviated with a dash and written as:
Cl2 F2 H2
Oxygen is also one of the diatomic molecules
How will two oxygen atoms bond?
Each atom has two unpaired electrons
Oxygen atoms are highly electronegative.
So both atoms want to gain two electrons.
Both electron pairs are shared.
two bonding pairs,
making a doublebond
For convenience, the double bond
can be shown as two dashes.
Structural Diagram for CO2
Structural Diagram for NH3