1
Q
1
A
Hydrogen H
2
Q
2
A
Helium He
3
Q
3
A
Lithium Li
4
Q
4
A
Beryllium Be
5
Q
5
A
Boron B
6
Q
6
A
Carbon C
7
Q
7
A
Nitrogen N
8
Q
8
A
Oxygen O
9
Q
9
A
Fluorine F
10
Q
10
A
Neon Ne
11
Q
11
A
Sodium Na
12
Q
12
A
Magnesium Mg
13
Q
13
A
Aluminium Al
14
Q
14
A
Silicon Si
15
Q
15
A
Phosphorus P
16
Q
16
A
Sulfur S
17
Q
17
A
Chlorine Cl
18
Q
18
A
Argon Ar
19
Q
19
A
Potassium K
20
Q
20
A
Calcium Ca
elements (first 20)
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