Different shells can hold different maximum numbers of electrons. Electrons occupy shells starting with the innermost one. They begin to occupy the next shell when a shell becomes full.

In this topic, we will concern ourselves with the elements of the third period: scandium to zinc. The electron configurations of the 3rd period d-block elements are shown below: The electron ...

Element 103 in the periodic table is called lawrencium ... still persist at the end of the first decade of the 21st century? The answer is that electronic configurations of atoms are not sufficient to ...