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Compare elements

Put two to four elements side by side. The highest and lowest value in each row are marked.

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HighestLowestin each row

Comparison of Fluorine, Chlorine, Bromine, Iodine
	9FFluorine	17ClChlorine	35BrBromine	53IIodine
Category	Halogen	Halogen	Halogen	Halogen
Position	Group 17 · Period 2 · p-block	Group 17 · Period 3 · p-block	Group 17 · Period 4 · p-block	Group 17 · Period 5 · p-block
State at 25 °C	Gas	Gas	Liquid	Solid
Atomic mass	18.998 uLowest	35.450 u	79.904 u	126.900 uHighest
Electronegativity	3.98Highest	3.16	2.96	2.66Lowest
First ionization energy	1,681.0 kJ/molHighest	1,251.2 kJ/mol	1,139.9 kJ/mol	1,008.4 kJ/molLowest
Electron affinity	322.2 kJ/mol	349.0 kJ/molHighest	324.7 kJ/mol	295.1 kJ/molLowest
Atomic radius	50 pmLowest	100 pm	115 pm	140 pmHighest
Covalent radius	57 pmLowest	102 pm	120 pm	139 pmHighest
Density	0.002 g/cm³Lowest	0.003 g/cm³	3.110 g/cm³	4.930 g/cm³Highest
Melting point	53.5 KLowest	171.7 K	266.0 K	386.9 KHighest
Boiling point	85.0 KLowest	239.1 K	332.0 K	457.6 KHighest
Electron configuration	[He] 2s² 2p⁵	[Ne] 3s² 3p⁵	[Ar] 3d¹⁰ 4s² 4p⁵	[Kr] 4d¹⁰ 5s² 5p⁵
Valency	1	1, 3, 5, 7	1, 3, 5	1, 3, 5, 7
Common oxidation states	−1	−1, +1, +3, +5, +7	−1, +1, +3, +5	−1, +1, +3, +5, +7
Discovered	1886	1774	1826	1811
Atomic model
Main uses	Not written yet	Not written yet	Not written yet	Not written yet