Answer:
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- silicone
15.P-phosphorus
16.S-sulfur
17.Cl-chlorine
18.Ar-argon
19.K- potassium
20.Ca- calcium
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One way to memorize is to write everything down over and over or some people say exercising or Yoga Works.