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Astatine is a
chemical element; it has
symbol At and
atomic number 85. It is the
rarest naturally occurring element in the Earth's crust,
occurring only...
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Astatine (85At) has 41
known isotopes, all of
which are radioactive;
their m****
numbers range from 188 to 229 (though 189At is undiscovered).
There are...
- less
frequently so classified: carbon, aluminium, selenium,
polonium and
astatine. On a
standard periodic table, all
eleven elements are in a
diagonal region...
-
chlorine (Cl),
bromine (Br),
iodine (I), and the
radioactive elements astatine (At) and
tennessine (Ts),
though some
authors would exclude tennessine...
-
second rarest naturally occurring element (after
astatine). Francium's
isotopes decay quickly into
astatine, radium, and radon. The
electronic structure of...
-
Astatine compounds are
compounds that
contain the
element astatine (At). As this
element is very radioactive, few
compounds have been studied. Less reactive...
- of
astatine would be 147 pm. With the
seven outermost electrons removed,
tennessine is
finally smaller; 57 pm for
tennessine and 61 pm for
astatine. The...
- 1019 years, polonium,
astatine, and
radon are some of the shortest-lived and
rarest elements known; less than a gram of
astatine is
estimated to exist...
- more
different halogen atoms (fluorine, chlorine, bromine, iodine, or
astatine) and no
atoms of
elements from any
other group. Most
interhalogen compounds...
- in
nature after all:
technetium (element 43),
promethium (element 61),
astatine (element 85),
neptunium (element 93), and
plutonium (element 94). No element...
