???????? ??????

https://ml.wikipedia.org/wiki/Polonium

84 bismuth ← polonium → astatine Te ↑ Po ↓ Uuh ??????????????? - ?????? ???????????????
??????
???? , ??????? , ????????	polonium, Po, 84
???????	metalloids
???????? , ?????? , ????????	16 , 6 , p
????	silvery
?????? ???????? ????	(209)  g·mol −1
????????? ????????	[ Xe ] 6s 2 4f 14 5d 10 6p 4
??? ??????????? ????????????	2, 8, 18, 32, 18, 6
???????????????
Phase	solid
???????? (near r.t. )	(alpha) 9.196  g·cm −3
???????? (near r.t. )	(beta) 9.398  g·cm −3
??????????	527  K (254 ° C , 489 ° F )
??????????	1235  K (962 ° C , 1764 ° F )
???????? ???????	ca. 13   kJ·mol −1
????????? ???????	102.91   kJ·mol −1
Heat capacity	(25 °C) 26.4  J·mol −1 ·K −1
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K)       (846) 1003 1236
Atomic properties
?????????? ???	cubic
???????????????	4 , 2 ( amphoteric oxide)
?????????????????????	2.0 (Pauling scale)
???????? ??????	1st: 812.1 kJ/mol
Atomic radius	190   pm
Atomic radius (calc.)	135  pm
Miscellaneous
Magnetic ordering	nonmagnetic
??????? ?????????	(0 °C) (α) 0.40 μΩ·m
??? ?????	(300 K)  ? 20  W·m −1 ·K −1
Thermal expansion	(25 °C) 23.5  µm·m −1 ·K −1
CAS registry number	7440-08-6
Selected isotopes
Main article: Isotopes of ???????? iso NA half-life DM DE ( MeV ) DP 208 Po syn 2.898 y α 5.215 204 Pb ε , β + 1.401 208 Bi 209 Po syn 103 y α 4.979 205 Pb ε , β + 1.893 209 Bi 210 Po syn 138.376 d α 5.407 206 Pb
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???????? 84 ?? ???????? ???????? . Po ??? ??????????????????? ??????? ???????. ???????? ???? ???????????????? ??? ?????????????? . ????????? ??????? , ???????? ?????????? ???????? ??????????????????. ???????? ????????? ? ????? ?????????????. ????????? ??? ??????????. ??????? ????? ??????????????? ????????????? ???. 1898 -? ???? ????????? ???????? ????? ????????? ????????? ? ????? ????????????.

?????????????? ??????????? ? ????? ????????????. ??? ???????????????? ?????????? .