The elements on the Periodic Table that we use today are arranged by

They are arranged by in order by the increasing atomic number.

Explanation:

The horizontal rows are called periods and the vertical columns are called groups.Elements in the same group have similar chemical properties.This is because they have the same number of our electron and the same valency.

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well it depends i think people around the world are coming around to gay marriage. but if you are talking abortion then wow, so much to talk about. such as men thinking they have the right to choose if women can, the fact there are health concerns if the women can't get one, and many more arguments to discuss. so i would definitely say abortion would be a much more interesting topic.