Question

30 to 40 elements with atomic mass atomic number and valency

Answer 1

Atomic numbers..element.. atomic weight
30 zinc 65.39
31 gallium 69.723
32 germanium 72.61
33 arsenic 74.922
34 selenium 78.96
35 bromine 79.904
36 krypton 83.8
36 rubidium 85.468
38 strontium 87.62
39 Ytterium 88.906
40 zirconium 91.224
hope this helps dude