Sassafras Chemistry Chapter 2

The periodic table was first designed by Dmitri Mendeleev.

An element is made up of multiple different atoms.

A substance made up of one type of atom, which cannot be broken down by chemical reaction to form a simpler substance.

An atom that has a different number of neutrons and so has a different mass number from the other atoms of an element.

The Egyptions were the first to discuss the concept of an atom. They believed that matter could be cut into smaller and smaller pieces but eventually you would get to a piece that could not be cut.

An isotope is an atom that has a different number of neutrons. True or false

Ancient philosophers believed that all substances were made from the combination of which four elements.