Question

6 Initially it was believed that atomic mass of beryllium was 13
But Mendeléev suggested that its atomic mass should be 9
(1) Was Mendeleev suggestion correct?
(ii) How had he reached to this conclusion?​

Answer 1

Answer:

jsjhhhjskkjhhejjiiejhhehhhieiiuuuwuuuyheggghehjjkkkkekjejejjejheyyuriooytsfhjskdouggzj