Question

Give approx molecular mass of first 30 elements .Plz answer fast.
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Answer 1

Answer:

Element Atomic Number Atomic Mass Valency

Hydrogen 1 1.0079 (-1), +1

Helium 2 4.0026 0

Lithium 3 6.941 +1

Beryllium 4 9.0122 +2

Boron 5 10.811 -3, +3

Carbon 6 12.0107 (+2), +4

Nitrogen 7 14.0067 -3, -2, -1, (+1), +2, +3, +4, +5

Oxygen 8 15.9994 -2

Fluorine 9 18.9984 -1, (+1)

Neon 10 20.1797 0

Sodium 11 22.9897 +1

Magnesium 12 24.305 +2

Aluminum 13 26.9815 +3

Silicon 14 28.0855 -4, (+2), +4

Phosphorus 15 30.9738 -3, +1, +3, +5

Sulfur 16 32.065 -2, +2, +4, +6

Chlorine 17 35.453 -1, +1, (+2), +3, (+4), +5, +7

Argon 18 39.0983 0

Potassium 19 39.948 +1

Calcium 20 40.078 +2

Scandium 21 44.9559 +3

Titanium 22 47.867 +2, +3, +4

Vanadium 23 50.9415 +2, +3, +4, +5

Chromium 24 51.9961 +2, +3, +6

Manganese 25 54.938 +2, (+3), +4, (+6), +7

Iron 26 55.845 +2, +3, (+4), (+6)

Nickel 27 58.6934 +2, +3, (+4)

Cobalt 28 58.9332 (+1), +2, (+3), (+4)

Copper 29 63.546 @+1, +2, (+3)

Zinc 30 65.39 +2

Answer 2

Answer:

the molecules and their masses are as follows

Explanation:

1. Hydrogen-1.0079
2. Helium -4.0026
3. Lithium-6.941
4. Beryllium-9.01218
5. Boron-10.81
6. Carbon-12.01
7. Nitrogen-14.0067
8. Oxygen-15.9994
9. Flourine -18.9984
10. Neon-20.18
11. Sodium-22.98977
12. Magnesium-24.305
13. Aluminum -26.98
14. Silicon -28.09
15. Phosphorus-30.97
16. Sulphur-32.07
17. Chlorine-35.45
18. Argon-39.95
19. Potassium-39.0983
20. Calcium-40.08
21. Scandium-44.9559
22. Titanium-47.9559
23. Vanadium-50.9415
24. Chromium-51.996
25. Manganese-54.9380
26. Iron-55.847
27. Cobalt-58.93
28. Nickel-58.69
29. Copper-63.55
30. Zinc-65.38