give 1to20of atomic number
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the answer of this question is 1 ,2, 3, 4, 5, 6 ,7 ,8, 9 ,10, 11 ,12 ,13 ,14 ,15 ,16 ,17 ,18 ,19 or 20 that's ur answer
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1 hydrogen
2helium
3lithium
4berelium
5boron
6carbon
7 nitrogen
8oxygen
9fluorine
10 neon
11sodium
12 magnesium
13 almunium
14 silicon
15 phosphorus
16sulphur
17 chlorine
18argon
19potassium
20 calcium
2helium
3lithium
4berelium
5boron
6carbon
7 nitrogen
8oxygen
9fluorine
10 neon
11sodium
12 magnesium
13 almunium
14 silicon
15 phosphorus
16sulphur
17 chlorine
18argon
19potassium
20 calcium
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