it is necessary to make a Periodic Table because it makes it easier to find elements that have similar physical characteristics and to find out the amounts of "shells" an element has of the amount of electrons on the elements vallence.
No, it is not necessary.
Iron (Fe)
no - gases are few in number - metals make up most of the periodic table
No, Dmitri Mendeleev in Russia developed the first periodic table.
Mendeleev supposed that a new row is necessary in the periodic table after the discovery of lanthanoides.
Periods in the periodic table represent the number of electron shells necessary to fit all of the electrons. Once you fill the valence shell of an atom, the next electron must go in a new electron shell. This would constitute a new period on the periodic table.
You dont
The answer is Group 17 Halogens.
118 elements.
Sperm is not an element and therefore does not form any part of the periodic table.
It is named The PERIODIC TABLE. The periods being the horizontal rows The groups being the vertical columns.
No they did not.