Before their so-called 4f subshell fills up, the additional electrons begin making new shells. Then, gradually, as you move across the periodic table to heavier atoms in the lanthanide series ...

Before their so-called 4f subshell fills up, the additional electrons begin making new shells. Then, gradually, as you move across the periodic table to heavier atoms in the lanthanide series ...

An atom is in a stable configuration when its outermost shell is full and far separated ... strength of the cluster. Although the periodic table has more than one hundred elements, there are ...