Can the following group of elements be classified as dobereiner's triad
(a) NA,Si,Cl
(b) Be,Mg,Ca
Atomic mass of Be-9,Na-23,Mg-24,Si-28,Cl-25, Ca-40. Justify in your answer in the case?
Answers
Answered by
11
Answer:
No. Na, Si, Cl cannot be classified as Dobereiner's triad. Although the atomic mass of silicon (Si) is average of atomic masses of sodium (Na) and chlorine (Cl), all these elements do not have similar properties.
23 (Na) + 35 (Cl)/2 = 29
(b) Yes. Be, Mg, Ca cannot be classified as Dobereiner's triad. They have similar properties and the atomic weights of magnesium (Mg) is roughly the average of the atomic weights of Be and Ca.
9 (Be) + 40 (Ca)/2 = 24.5
Dobereiner’s triad suggested relationship between properties of elements and their atomic weights. The atomic weight of the middle element is approximately equal to the average weights of other two elements.
Similar questions