Question

Give approx. atomic mass of first 30 elements

Answer 1

the ans is 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. plzz mark me brainliest ans