Question

Which are the twenty main elements

Answer 1

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

Answer 2

1)hydrogen
2)helium
3)lithium
4)beryllium
5)boron
6)carbon
7)nitrogen
8)oxygen
9)fluorine
10)neon
11)sodium
12)magnesium
13)aluminium
14)silicon
15)phosphorus
16)sulphur 
17)chlorine
18)argon
19)potassium
20)calcium

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