Rare earth elements have a number of useful ... at the bottom of the periodic table, as well as the elements yttrium and scandium. The most valuable of these are neodymium, praseodymium, terbium ...

AN important result of the development of Moseley's atomic number rule has been the impetus ... It is true that later arrangements of the Periodic Table indicated that eka-csesium, eka- and ...

Then, gradually, as you move across the periodic table to heavier atoms in the lanthanide series, that 4f subshell finally fills up with its maximum number of 14 electrons. Why would this matter ...

neodymium, and praseodymium. Ferromagnetic elements tend to have unpaired electrons, like those from the middle of the d- and f-blocks of the periodic table. But what about nitrogen, all the way ...