Physical Properties Of Oxygen Family

January 29, 2013 General Knowledge

PROPERTY	ELEMENT
PROPERTY	O	S	Se	Te		Po
Atomic number	8	16	34	52		84
Atomic mass	16.00	32.06	78.96	127.60		210
Covalent radius/pm	74	103	119		142	168
Ionic radius/pm(M^2-)	140	184	198		221	230
First ionization energy kj mol^-1	1314	1000	941		869	813
Second ionization energy kj mol^-1	3388	2251	2045		1790	–
Electronegativity	3.5	2.5	2.4		2.1	2.0
Density (g/cm³)	1.32	2.06	4.19		6.25	–
Melting point (K)	84	393	490		725	520
Boiling point	90	718	958		1260	1235

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