Question

2.
Column A
1) Triads
2) Octave
3) Atomic number
4) Atomic mass number
Column B
a) Mendeleev
b) Dobereiner
c) Thomson
d) Moseley
e) Newland​

Answer 1

HEY FRIEND HERE IS YOUR ANSWER1=b, 2=e, 3=d, 4=a

Answer 2

Answer:

1) Triads - b) Dobereiner

2) Octave - e) Newland

3)Atomic number- d) Moseley

4) Atomic mass number- a) Mendeleev