At
Astatine is the rarest naturally occurring element on Earth.
የፊዚክስ ባህሪያት
| አቶሚክ | 209.98715 u |
| ብዛት | 7.0 g/cm³ |
| የቀለም አማራጭ | 575.0 K |
| የሙቀት መጠኑ፦ | 610.0 K |
| ቅርጽ | Likely metallic |
| የክፍሉ ወቅት | ቀጥ ያለ |
የኬሚካል ባህሪያት
| ሴኮንዶች | 2.2 (ፒየር) |
| ፊደል ሠሌዳው፦ | 899.0 kJ/mol |
| ፊደል ሠሌዳው፦ | 270.1 kJ/mol |
| መተላለፊያ | -1, +1, +3, +5, +7 |
የፊደል ቅርጽ ምርጫዎች
| የኤሌክትሮን ማስተካከያ | [Xe] 4f14 5d10 6s2 6p5 |
| አቶሚክ | 150.0 pm |
| ሬዲየስ | 150.0 pm |
| ቫን ዴር ዋልስ | 202.0 pm |
መከፈት
| የተገኘው በ | Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segre |
| የምርምር ዓመት | 1940 |
| ቦታ | Berkeley, California, USA |
| ስም፦ (_N) | Greek 'astatos' meaning unstable |
ስለ Astatine
Astatine is extremely rare, radioactive, and the heaviest known halogen. Less than 30 grams exist in Earth's crust at any time. It has never been seen in bulk.
ፕሮግራሞች
Potential targeted cancer therapy (astatine-211), still experimental.
ሐቅ
Astatine has never been seen with the naked eye -- there is less than 30 grams in the entire Earth at any moment.
ሴኮንዶች
| ብዛት | ብዛት | አራተኛ | ቋሚ |
| 209 | - | 5.41 hours | አዎ |
| 210 | - | 8.1 hours | አዎ |
| 211 | - | 7.214 hours | አዎ |
የኤሌክትሮን ማስተካከያ
[Xe] 4f14 5d10 6s2 6p5