Why is lathanide and actinide not part of the periodic table?

Answer 1

Besides the Periodic Table, an electron chart of the elements exists. The periodic table shows the broad outline. The electron chart goes into greater detail. The periodic table lists elements according to electrons in their outer shell. As elements get more massive they get more protons and electrons. Each time they add a proton, they jump one notch in the periodic table. When they add the electron, it is a valence electron and it affects the chemical properties. There comes a point when elements start adding electrons when the electrons are not added to the outer shell with the other electrons in the valence shell. The chemical properties do not change as the elements get heavier. It is extremely difficult to use chemistry to separate the elements in that group. If you had an electron chart, you would see the electrons followed a different pattern. That is why the lanthanides and actinides are set apart from the other elements on the periodic table. According to their chemical properties, they would all need to be put into one box.

Answer 2

it is because the lanthinides and actinides have there prepenultimate shell complete to acquire stability as they are stable by completing there pre-- penultimate shell ,,,they gain stability...As far as other elements are conCERND completion of their penultimate or ultimate shell,,gives them stability so they are outside the table

penultimate shell --- shell inner to valence or outermost or ultimate shell

ultimate shell--outermost shell

Answer 3

Partly for convenience, since a "super-wide" form periodic table would be too wide to fit on a single normal page. This is also justified chemically, because all of these elements have chemical properties very similar to each other and to other elements in column 3.

Why_are_the_lanthanides_and_actinides_placed_below_the_periodic_table

Answer 4

They are not actually detached. They are only put at the bottom to condense the periodic table more reasonably. If you look at a picture of the extended periodic table you would see that they are right in there with the transition metals

Answer 5

To avoid having to print the table on even wider paper, thus turning it into the "Periodic Banner of the Elements".

Answer 6

One set is more synthetic the other is more natural.

Answer 7

Lanthanide and actinide are not individual elements they refer to a series or group of several elements which are on the periodic table

Answer 8

They are placed at bottom. It makes study of elements easier.

Answer 9

They are. But they are often shown separately just to save space; otherwise, the periodic table would be too wide for easy viewing.