Question

20 popular elements ex: hydrogen,oxygen,thorium,

Answer 1

Hydrogen
Helium
Neon
Lithium
Uranium
Sodium
Pottasium
Barium
Argon
Krypton
Xenon
Radon
Rabdium
Francium
Magnesium
Calcium
Stroncium
Rhodium
Carbon
Sillicon
Germanium

Answer 2

20 POPULAR ELEMENTS ARE:
1-HYDROGEN
2-HELIUM 
3-CARBON
4-NITROGEN 
5-OXYGEN
6-CHLORINE
7-LITHIUM
8-BORON
9-NEON
10-SODIUM
11-POTASSIUM
12-CALCIUM
13-ALMUNIUM
14-SULPHUR
15-COPPER
16-ZINC
17-NICKEL
18-COBALT
19-MAGNESSIUM
20-IRON