CBSE Class 9 Answered
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 |
Potassium |
18 |
39.0983 |
0 |
Argon |
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 |