1 To 20 Atomic Number

List of first 50 elements of the periodic table by atomic number including the chemical symbol and the atomic weight. You can print the list of elements by hitting the print button below.

Atomic Number	Chemical Symbol	Element Name	Atomic Weight (u)
1	H	Hydrogen	1.008
2	He	Helium	4.002602
3	Li	Lithium	6.94
4	Be	Beryllium	9.0121831
5	B	Boron	10.81
6	C	Carbon	12.011
7	N	Nitrogen	14.007
8	O	Oxygen	15.999
9	F	Fluorine	18.99840316
10	Ne	Neon	20.1797
11	Na	Sodium	22.98976928
12	Mg	Magnesium	24.305
13	Al	Aluminium	26.9815385
14	Si	Silicon	28.085
15	P	Phosphorus	30.973762
16	S	Sulfur	32.06
17	Cl	Chlorine	35.45
18	Ar	Argon	39.948
19	K	Potassium	39.0983
20	Ca	Calcium	40.078
21	Sc	Scandium	44.955908
22	Ti	Titanium	47.867
23	V	Vanadium	50.9415
24	Cr	Chromium	51.9961
25	Mn	Manganese	54.938044
26	Fe	Iron	55.845
27	Co	Cobalt	58.933194
28	Ni	Nickel	58.6934
29	Cu	Copper	63.546
30	Zn	Zinc	65.38
31	Ga	Gallium	69.723
32	Ge	Germanium	72.63
33	As	Arsenic	74.921595
34	Se	Selenium	78.971
35	Br	Bromine	79.904
36	Kr	Krypton	83.798
37	Rb	Rubidium	85.4678
38	Sr	Strontium	87.62
39	Y	Yttrium	88.90584
40	Zr	Zirconium	91.224
41	Nb	Niobium	92.90637
42	Mo	Molybdenum	95.95
43	Tc	Technetium	98
44	Ru	Ruthenium	101.07
45	Rh	Rhodium	102.9055
46	Pd	Palladium	106.42
47	Ag	Silver	107.8682
48	Cd	Cadmium	112.414
49	In	Indium	114.818
50	Sn	Tin	118.71

First 10 Periodic Table

Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here! Atomic Number of Elements from 1 to 30. Ans: Given below is the atomic mass number of the first 20 elements.