Initially it was believed that atomic mass of beryllium was 13. but mendeleev suggested that its atomic mass should be 9. (i)Was mendeleev suggestion correct? (ii)How were he reached to this conclusion?
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Yes , Mendeleev suggestion was correct . Because First we have taken hydrogen as the standard to find the masses of different elements but it didn't give us the correct value of masses of different elements . Then we have taken oxygen as our standard then we face the same problem . At last we have taken 12 isotope of carbon a our standard By This we get the correct value of masses of different elements.
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Most of Mandeleev's suggestion were based on assumption. There were no experimental proof for his suggestions. Example, he changed the atomic mass of Be to 9 and placed above Mg in his table which is correct, as the properties of Be and Mg were same. Later these elements were named as alkaline earth metal.
So Mandeleev's suggestion was correct.
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