Rationalised 2023-24
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Chemistry
The actinoids are radioactive elements and the earlier members have
relatively long half-lives, the latter ones have half-life values ranging from
a day to 3 minutes for lawrencium (Z =103) The latter members could be
prepared only in nanogram quantities These facts render their study
more difficult All the actinoids are believed to have the electronic configuration of 7s
2
and variable occupancy of the 5f and 6d subshells