Question

Döbereiner showed that when the three elements were written in the order of increasing atomic masses; the atomic mass of the middle element was roughly the average of the atomic masses of the other two elements.” What are these ‘groups’ of elements called?

1 point​

Answer 1

Answer:

chemistry okkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk

Answer 2

transitions element maybe