The 3d level becomes more stable as we move from left to right on the periodic chart. Remember there is an increase in the number of protons consequently an increase in the number of electrons as we move from left to right on the chart. You should be able to do the electron configuration for any element on the chart which follows the basic rules and the d 5 and d 10 exceptions. I want you to be able to use the Periodic Chart to do electron configurations. At the top left of the periodic table which you have been given, write the letter n. at the beginning of each row write a number beginning with 1 and ending with 7.
Electrons leave the outer most shell first.
Unpaired electrons give a paramagnetic substance. A paramagnetic substance is one that is attracted into a magnetic field . An atom with an excess number of electrons of one kind of spin will exhibit a net magnetism. The experimental evidence is that in a magnetic field a paramagnetic element weighs more than in a nonmagnetic field environment. An element in which all the electrons are paired is a diamagnetic substance.