The three elements A, B and C form the Döbereiner's triads. If the atomic mass of element A is 7 and the atomic mass of element C is 39, what will be the atomic mass of element B?
1
46
2
22
3
32
4
23
The three elements A, B and C form the Döbereiner's triads. If the atomic mass of element A is 7 and the atomic mass of element C is 39, what will be the atomic mass of element B?