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| ନାମ, ପ୍ରତୀକ | astatine, At |
|---|
| Appearance | unknown, but probably a black solid; possibly metallic in appearance |
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| ଉଚ୍ଚାରଣ | AS-tə-teen or AS-tə-tin |
|---|
|
|
|
| ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 85 |
|---|
| ଶ୍ରେଣୀ, ବ୍ଳକ | group 17 (halogens), p-block |
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| ପର୍ଯ୍ୟାୟ | period 6 |
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| ମୌଳିକ ପ୍ରକାର | halogen, sometimes classified as a metalloid (disputed) |
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| ମାନକ ପରମାଣବିକ ଓଜନ (Ar) | (210) |
|---|
| ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Xe] 4f14 5d10 6s2 6p5 |
|---|
per shell | 2, 8, 18, 32, 18, 7 |
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|
| ଅବସ୍ଥା | solid |
|---|
| ଗଳନାଙ୍କ | 575 K (302 °C, 576 °F) |
|---|
| ସ୍ଫୁଟନାଙ୍କ | 610 K (337 °C, 639 °F) |
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| Heat of | (At2) 54.39 kJ/mol |
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pressure
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
361 |
392 |
429 |
475 |
531 |
607 |
|
|
| Oxidation states | −1, +1, +3, +5, +7 |
|---|
| Electronegativity | Pauling scale: 2.2 |
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| Covalent radius | 150 pm |
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| Van der Waals radius | 202 pm |
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|
| Thermal conductivity | 1.7 W/(m·K) |
|---|
| Magnetic ordering | no data |
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| CAS Number | 7440-68-8 |
|---|
|
| ଆବିଷ୍କାର | Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè (1940) |
|---|
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| | references |