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A chlorine atom has 7 electrons in its outer shell. Chlorine is in group 7 of the periodic table. A hydrogen atom has 1 electron in its outer shell. Hydrogen can only form 1 bond. The hydrogen atom will share its 1 electron with chlorine to form one covalent bond and make a hydrogen chloride molecule (HCl).This is a picture of a hydrogen chloride molecule. hydrogen atom has 1 electron in its outer shell. Hydrogen can only form 1 bond. The hydrogen atom will share its 1 electron with chlorine to form one covalent bond and make a hydrogen chloride molecule (HCl).
When the difference in electronegativity between two atoms is between about 0.4 and 1.7, then the bond is said to be polar covalent. A difference between 0 and 0.4 is nonpolar. Hydrogen's electronegativity is 2.2 and chlorine's is 3.16.The difference between the two is 0.96, indicating that it's a polar bond.olar Hydrochloric acid (HCl) is polar covalent because the electrons are more attracted to the chlorine and not the hydrogen. The hydrogen will sustain a slight positive char â¦ ge, and chlorine will sustain a slight negative one, making the compound polar. The affinity to electrons is called electronegativity.