ICSE Class 9 Answered
Please let me know the list of 1st 20 elements
Asked by shashikantbbatra | 03 Jul, 2020, 08:00: AM
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
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 Ramandeep | 03 Jul, 2020, 05:57: PM
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