What do periods and groups have in common in a periodic table?

Answer 1

Every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons. It goes down the Periodic Table like that. This also means that the atomic weight of the elements gets larger and larger in each period.

Answer 2

Elements in a Period Have how many shells for the Electrons in Common. eg. period 3 elements all have 3 shells.

The number of electrons in a shell goes like this:

2,8,8,18,18,18,3.

Answer 3

Periods and groups are both ways of organizing elements on the periodic table. Periods are horizontal rows that indicate the number of electron shells an element has, while groups are vertical columns that show elements with similar chemical properties due to having the same number of valence electrons.

Answer 4

See the link bellow for details.