Question

Molecular weights of first 30 elements.
PLZ answer my question if you know answer.
dont answer the question if you dont know answer.

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Answer 1

Answer:

ATOMIC NUMBER ELEMENT ATOMIC MASS

1 Hydrogen 1.008

2 Helium 4.0026

3 Lithium 6.94

4 Beryllium 9.0122

5 Boron 10.81

6 Carbon 12.011

7 Nitrogen 14.007

8 Oxygen 15.999

9 Fluorine 18.998

10 Neon 20.180

11 Sodium 22.990

12 Magnesium 24.305

13 Aluminium 26.982

14 Silicon 28.085

15 Phosphorus 30.974

16 Sulfur 32.06

17 Chlorine 35.45

18 Argon 39.948

19 Potassium 39.098

20 Calcium 40.078

21 Scandium 44.956

22 Titanium 47.867

23 Vanadium 50.942

24 Chromium 51.996

25 Manganese 54.938

26 Iron 55.845

27 Cobalt 58.933

28 Nickel 58.693

29 Copper 63.546

30 Zinc 65.38

Answer 2

Answer:

plze mark it as brainliest answer....

Explanation:

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

hope it helps....

samaj jana plze..