article_snippet.sent: The rare metal currently sits at the very bottom of the periodic table at the end of a group of elements known as the actinides, which sit in a separate block from the main table.
article_snippet.sent: – the last column of lanthanides and actinides – could be put into the group III column of the periodic table, under scandium and yttrium.
article_snippet.sent: The current structure of the periodic table was drawn up in 1945 after the Nobel-prize winning chemist Glenn Seaborg suggested the actinides - rare radioactive elements - belonged in a separate part of the table which is known as 'f-block'.
article_snippet.sent: Lutetium and lawrencium, rather than Lanthanum and Actinium, should be assigned to the d-block as the heavier analogs of Scandium and Yttrium, whereas Lanthanum and Actinium should be considered as the first members of the f-block with irregular configurations.'
article_snippet.sent: The researchers found This matched a recent prediction of 4.96eV - giving This the lowest ionisation potential of all elements in the f-block.
article_snippet.sent: the Japan Atomic Energy Agency said: 'Since the introduction of the 'actinide concept' as the most dramatic modern revision of the Periodic Table of the Elements by Glenn Seaborg in the 1940s, the element with atomic number 103, lawrencium (Lr), played a crucial role as the last element in the actinide series. '
article_snippet.sent: the Japan Atomic Energy Agency show that removing the outermost electron requires least energy in Lr among all actinides, as was expected.
article_snippet.sent: This validates the position of Lr as the last actinide element and confirms the architecture of the Periodic Table.'
highlights_snippet.sent: The element found it is different from other rare radioactive elements in the f-block .
  