Why is it important that the elements are arranged in periods and groups?

Answer 1

if ur asking this, uve obviouslly looked at a periodic table before.. period is a set of elements whose outermost orbit is the same.. eg nitrogen and oxygen both have two orbits but their electrond differ. theyre in the same period.. if two elemens are in diff periods abut they have the same no of electrons in the outermost orbit, theyre said to be in the same group... eg carbon n silicon have two n three total no of orbits but four electrons in the outermost orbit

Answer 2

It is important to arrange elements in periods and groups so that there can be easily compared upon.
One example is the group of halogen. It is the Group VII of the periodic table. In the group, with the first element on the top being the mst reactive till the bottom.
Not only that, the table enables us to easily locate elements due to its valence electrons and number of shells

Answer 3

The periodic table of elements is designed to place elements with similar chemical properties in the same vertical rows, the horizontal rows are laid out in order of atomic weights and numbers, the atomic number indicates the number of protons in the atom. This a very convenient arrangement for chemists.