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First 20 Elements

The first twenty chemical elements - the ones worth memorizing in order, with symbols and categories.

Z	Symbol	Element	Category
1	H	Hydrogen	Nonmetal
2	He	Helium	Noble gas
3	Li	Lithium	Alkali metal
4	Be	Beryllium	Alkaline earth metal
5	B	Boron	Metalloid
6	C	Carbon	Nonmetal
7	N	Nitrogen	Nonmetal
8	O	Oxygen	Nonmetal
9	F	Fluorine	Halogen
10	Ne	Neon	Noble gas
11	Na	Sodium	Alkali metal
12	Mg	Magnesium	Alkaline earth metal
13	Al	Aluminium	Post-transition metal
14	Si	Silicon	Metalloid
15	P	Phosphorus	Nonmetal
16	S	Sulfur	Nonmetal
17	Cl	Chlorine	Halogen
18	Ar	Argon	Noble gas
19	K	Potassium	Alkali metal
20	Ca	Calcium	Alkaline earth metal

20 entries · Source: Wikipedia