Initially it was believed that atomic mass of beryllium was 13. but me

1.	Initially it was believed that atomic mass of beryllium was 13. but mendeleev suggested that its atomic mass should be 9. 1. was mendeleev suggestion correct? 2.how had he reached to this conclusion?
Answer» Initially it was believed that atomic mass of beryllium was 13. but mendeleev suggested that its atomic mass should be 9. 1. was mendeleev suggestion correct? 2.how had he reached to this conclusion?

Initially it was believed that atomic mass of beryllium was 13. but mendeleev suggested that its atomic mass should be 9. 1. was mendeleev suggestion correct? 2.how had he reached to this conclusion?

Answer»

Initially it was believed that atomic mass of beryllium was 13. but mendeleev suggested that its atomic mass should be 9.

1. was mendeleev suggestion correct?

2.how had he reached to this conclusion?