CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon


Question

The atomic masses of three elements $$A$$, $$B$$ and $$C$$ having similar chemical properties are $$7$$, $$23$$ and $$39$$ respectively.
(a) Calculate the average atomic mass of elements $$A$$ and $$C$$.
(b) Compare the average atomic mass with atomic mass of $$B$$.
(c) What could the elements $$A$$, $$B$$ and $$C$$ be?


Solution

(a) The average atomic mass of elements A and C $$\displaystyle = \dfrac{7+39}{2}$$ $$\displaystyle = \dfrac{46}{2}$$ $$\displaystyle =23$$
(b) The average atomic mass of elements A and C is the same as the atomic mass of element B=23.
(c) The element A is Lithium (Li), B is Sodium (Na) and C is Potassium (K). They are Dobereiner's Triads because in Dobereiner's Triads the atomic mass of the middle element is approximately the mean of the atomic masses of other two elements.

Chemistry

Suggest Corrections
thumbs-up
 
0


similar_icon
Similar questions
View More


similar_icon
People also searched for
View More



footer-image