CBSE Class 7 Answered
first 20 elements of periodic table
Asked by ashwanishuklafbd | 03 Jul, 2017, 09:12: PM
Expert Answer
First 20 elements of periodic table are:
|
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 |
Answered by Prachi Sawant | 04 Jul, 2017, 09:40: AM
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