Periodic trend sheet

118 elements · ChemTable · sample of the first 10 rows

Periodic trend sheet. The six figures the periodic trends are drawn from, element by element: atomic, covalent and van der Waals radii, electronegativity, first ionization energy and electron affinity. Sectioned by period, so reading down a column shows the trend across a row of the table and the page breaks fall between periods.
Z	Symbol	Name	Atomic radius pm	Covalent radius pm	Van der Waals radius pm	Electroneg. Pauling	1st ionization energy kJ/mol	Electron affinity kJ/mol
Period 1
1	H	Hydrogen	53	31	120	2.2	1312	73
2¹	He	Helium	31	28	140	not defined	2372	0
Period 2
3	Li	Lithium	167	128	182	0.98	520	60
4	Be	Beryllium	112	96	153	1.57	900	0
5	B	Boron	87	84	192	2.04	801	27
6	C	Carbon	67	76	170	2.55	1087	122
7	N	Nitrogen	56	71	155	3.04	1402	-7
8	O	Oxygen	48	66	152	3.44	1314	141
9	F	Fluorine	42	57	147	3.98	1681	328
10¹	Ne	Neon	38	58	154	not defined	2081	0

Assembled from the ChemTable element reference - the same figures published free on every element page, in the interactive table and in the list view. Nothing on this sheet is computed, rounded up or estimated beyond what those pages already show. Temperatures in kelvin, mass in unified atomic mass units (u), density in g/cm³. Radii are in picometres and both energies in kilojoules per mole, the units used on the element pages. The dataset is incomplete for the radii in particular; every gap is footnoted with the reason instead of being filled in.

Every value on this sheet is also free to read on its own element page and on the interactive periodic table. Premium pays for the format, not the facts.