Here we have the periodic table showing only the valence, or outer electrons in each element. It is these outermost electrons that determine an element’s reactivity. Some patterns should stand out.

While I don’t expect my elementary students to be able to memorize the periodic table of elements, I find it necessary for me to have an understanding of how these elements work so I can answer ...

If you are intimidated by the periodic table, then this introduction through the first column of elements will give you a feel for how and why the elements are arranged in this order.

GCSE Combined Science Building blocks for understanding learning resources for adults, children, ... The periodic table - AQA Synergy. Mendeleev made an early periodic table.