| A | B |
|---|
| atom | the smallest particle of an element that has the properties of the element |
| 100 plus | allscientists believe that all of the substances that make up matter are formed using this many different kinds of atoms |
| compound | a substance made up of more than one kind of element |
| living things | elements combine in many ways to produce compounds that can be found in nonliving things and |
| properties | every compound has its own properties which are different from those of the elements that make it up |
| molecule | two or more atoms joined together |
| oxygen | what kind of atoms make up an oxygen molecule |
| symbol | each block on the periodic table contains the element's name, its number, and its |
| electron | the particles in an atom with a negative charge |
| neutron | the particles inan atom with no charge |
| proton | the particles inan atom with positive electrical charge |
| periodic table | a chart that classifies elements by their properties |
| Mendeleev | he developed the periodic table |
| elements | the basic building blocks of all matter |
| matter | everything that takes up space and has mass |
