Question

what is the answer in the given photo ​

Answer 1

1. Modern Periodic table

2. Horizontal: periods. Vertical: groups

3. Nucleus

4. 1 amu

Please mark me brainliest

Answer 2

Answer:

1.) Modern

2.) Periods, Groups

3.) Nucleus

4.) 1.00727647 amu ≈ 1 amu