ପୋଲୋନିଅମ

Polonium, ₈₄Po
ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	polonium, Po
Appearance	silvery
ଉଚ୍ଚାରଣ	/p[invalid input: 'ɵ']ˈloʊniəm/ po-LOH-nee-əm
Polonium in the periodic table
	bismuth ← polonium → astatine
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	84
ଶ୍ରେଣୀ, ବ୍ଳକ	group 16 (chalcogens), p-block
ପର୍ଯ୍ୟାୟ	period 6
ମୌଳିକ ପ୍ରକାର	post-transition metal, post-transition metal status is disputed (see article text)
ମାନକ ପରମାଣବିକ ଓଜନ (Ar)	(209)
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Xe] 6s2 4f14 5d10 6p4
per shell	2, 8, 18, 32, 18, 6
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	527 K (254 °C, 489 °F)
ସ୍ଫୁଟନାଙ୍କ	1235 K (962 °C, 1764 °F)
Density near r.t.	(alpha) 9.196 g/cm3 ; (beta) 9.398 g/cm3
Heat of fusion	ca. 13 kJ/mol
Heat of	102.91 kJ/mol
Molar heat capacity	26.4 J/(mol·K)
Atomic properties
Oxidation states	6, 4, 2, −2; (amphoteric oxide)
Electronegativity	Pauling scale: 2.0
Atomic radius	empirical: 168 pm
Covalent radius	140±4 pm
Van der Waals radius	197 pm
Miscellanea
Crystal structure	cubic
Thermal expansion	23.5 µm/(m·K) (at 25 °C)
Thermal conductivity	? 20 W/(m·K)
Electrical resistivity	(α) 0.40 µ Ω·m (at 0 °C)
Magnetic ordering	nonmagnetic
CAS Number	7440-08-6
ଇତିହାସ
ଆବିଷ୍କାର	Pierre Curie and Marie Curie (1898)
First isolation	Willy Marckwald (1902)
Most stable isotopes of polonium
	view; talk; edit; \| references