I wanted to ask you in cbse class 12 boards we need to learn atmic masses of all elements given in a book table or 30 to 20 elements.
Asked by sukalp | 21st Sep, 2016, 05:35: AM
Expert Answer:
CBSE Class XII Chemistry
It is better to know the atomic masses of 30 elements as given below:
Element
Atomic Number
Atomic Mass
Hydrogen
1
1.0079
Helium
2
4.0026
Lithium
3
6.941
Beryllium
4
9.0122
Boron
5
10.811
Carbon
6
12.0107
Nitrogen
7
14.0067
Oxygen
8
15.9994
Fluorine
9
18.9984
Neon
10
20.1797
Sodium
11
22.9897
Magnesium
12
24.305
Aluminum
13
26.9815
Silicon
14
28.0855
Phosphorus
15
30.9738
Sulfur
16
32.065
Chlorine
17
35.453
Potassium
18
39.0983
Argon
19
39.948
Calcium
20
40.078
Scandium
21
44.9559
Titanium
22
47.867
Vanadium
23
50.9415
Chromium
24
51.9961
Manganese
25
54.938
Iron
26
55.845
Nickel
27
58.6934
Cobalt
28
58.9332
Copper
29
63.546
Zinc
30
65.39
|
Element |
Atomic Number |
Atomic Mass |
|
Hydrogen |
1 |
1.0079 |
|
Helium |
2 |
4.0026 |
|
Lithium |
3 |
6.941 |
|
Beryllium |
4 |
9.0122 |
|
Boron |
5 |
10.811 |
|
Carbon |
6 |
12.0107 |
|
Nitrogen |
7 |
14.0067 |
|
Oxygen |
8 |
15.9994 |
|
Fluorine |
9 |
18.9984 |
|
Neon |
10 |
20.1797 |
|
Sodium |
11 |
22.9897 |
|
Magnesium |
12 |
24.305 |
|
Aluminum |
13 |
26.9815 |
|
Silicon |
14 |
28.0855 |
|
Phosphorus |
15 |
30.9738 |
|
Sulfur |
16 |
32.065 |
|
Chlorine |
17 |
35.453 |
|
Potassium |
18 |
39.0983 |
|
Argon |
19 |
39.948 |
|
Calcium |
20 |
40.078 |
|
Scandium |
21 |
44.9559 |
|
Titanium |
22 |
47.867 |
|
Vanadium |
23 |
50.9415 |
|
Chromium |
24 |
51.9961 |
|
Manganese |
25 |
54.938 |
|
Iron |
26 |
55.845 |
|
Nickel |
27 |
58.6934 |
|
Cobalt |
28 |
58.9332 |
|
Copper |
29 |
63.546 |
|
Zinc |
30 |
65.39 |
Answered by Prachi Sawant | 21st Sep, 2016, 08:23: PM
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