Name the element that is an alkaline earth metal in period 6.
Cs
Ba
Au
Hg
Sr

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.

If many scientists conduct the same or similar experiments, and all obtain similar results, a can be written, which is a generally agreed-upon statement that explains and predicts how a natural phenomenon works.