CBSE Class 9 Science Periodic Classification Of Elements Online Test Set A

Question 1 of 15

Dobereiner, in 1829, pointed out that when elements are arranged in the order of increasing relative atomic masses, in a triad, the relative atomic mass of the middle element was approximatery equal to the mean of the relative atomic masses of the first and third elements. Name the element which is in between the elements calcium and barium :

Iodine

Magnesium

Beryllium

Strontium


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