Calculate the atomic mass (average) of chlorine using the following data:

By Ritesh|Updated : November 13th, 2022
 

% Natural Abundance

Molar Mass

35Cl

75.77

34.9689

37Cl

24.23

36.9659

The average atomic mass of chlorine = is 35.4527 u. Now we have to find the average atomic mass of chlorine

= [(Fractional Abundance of 35Cl) (Molar Mass of 35Cl) + (Fractional Abundance of 37Cl) (Molar Mass of 37Cl)]

Substituting the values we get:

= [{(75.77/100)(34.9689 u)} + {(24.23/100) (36.9659u)}

In simplification we get the:

= 26.4959 + 8.9568

= 35.4527 u

Hence, the average atomic mass of chlorine = 35.4527 u.

Properties of Chlorine

As a nonmetal in group 17, chlorine is the second halogen in the periodic table. As a result, its characteristics are comparable to those of fluorine, bromine, and iodine and are often in the middle of those of the first two. With seven electrons making up its valence shell in the third and outermost shell, chlorine has the electron configuration [Ne]3s23p5. It is, therefore, like all halogens, one electron short of having an octet, making it a potent oxidizer that interacts with other elements to complete its outer shell.

Between fluorine and bromine, this element's electronegativity is intermediate (the electronegativity of fluorine is 3.98, the electronegativity of chlorine is: 3.16, the electronegativity of bromine is 2.96, and the electronegativity of iodine is 2.66). According to periodic patterns, this element is more reactive than bromine and less reactive than fluorine. It is more potent than bromine, although being a less potent oxidising agent than fluorine. Comparatively speaking, the chloride ion is a stronger reducing agent than fluoride but weaker than bromide.

Summary:

Calculate the atomic mass (average) of chlorine using the following data.

The average atomic mass of chlorine = is 35.4527 u. Chlorine is the second halogen in the periodic table, being a nonmetal in group 17. Hence, its properties are similar to fluorine, bromine, and iodine, and are generally intermediate among those of the first two.

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