Question

Can the following elements are classified as doberiners triads a)na,si,cl
b)be,mg,ca

Answer 1

Answer:

a) No b)Yes

Explanation:

a)The elements Na, Si and Cl cannot be classified as Dobereiner's triad. The arithmetic mean of the atomic masses of Na (22.98 u) and Cl (35.45 u) is 29.215. This is not the atomic mass of Si (14 u). This does not follow the rules of the triad. Besides, the properties of Na, Si and Cl are quite different from each other.

b) The elements Be, Mg and Ca can be classified as Dobereiner's triad. This is because the arithmetic mean of Be(9 u) and Ca (40 u) is 24.5. This is close to the atomic mass of Mg which is 24.305. Besides, they also have several similar properties.

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