| A | B |
|---|
| ATOMS | SMALLEST UNIT OF MATTER WITH PROPERTIES OF SINGLE ELEMENT |
| ELEMENT | PURE SUBSTANCE OF ONE TYPE OF ATOM |
| SUBATOMIC PARTICLES | PARTICFLES THAT MAKEUP AN ATOM |
| PROTONS | POSITIVE ATOMIC PARTICLE FOUND IN THE NUCLEUS OF AN ATOM |
| NEUTRONS | NEUTRALLY CHARGED PARTICLE FOUND IN THE NUCLEUS OF AN ATOM |
| ELECTRONS | NEGATIVE ATOMIC PARTICLES FOUND SURROUNDING THE NUCLEUS |
| ATOMS | smallest constituent unit of ordinary matter that has the properties of a chemical element. |
| ELEMENT | PURE SUBSTANCE OF ONE KIND OF ATOM |
| NUCLEUS | center of an atom; made up of protons and neutrons |
| PERIODIC LAW | properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number |
| METALS | grouped on left side of periodic table; elements are shiny and conduct heat and electricity |
| NONMETALS | elements that are poor conductors of heat and electricity; grouped on the right side of periodic table |
| METALLOIDS | elements that have properties of metals and nonmetals |
| ATOMIC MASS | weighted average mass of element's isotopes |
| MENDELEEV | father of periodic table: determined the relationship of elements to organize them into a table |
| physical change | no change in the chemical makeup of substance |
| physical change | changes between states of matter such as freezing and melting |
| metals | classification of elements such as zinc and copper |
| oxygen | Name of element with atomic number of 8 |
| metalloids | classification of elements such as boron and astatine |
| boron | Name of element with 5 protons |
| silver | Name of element with symbol of Ag |
| helium | Name of element with 2 electrons |
| nonmetals | classification of elements such as carbon and fluorine |
| chemical change | result of a reaction in which the chemical makeup of the substance changes |
| physical change | boiling liquid water changes to steam |
| protons | same as atomic number |
| electrons | atom has no charge, is neutral so number of protons equals number of ________ |
| element | A substance composed of a single kind of atom. |
| AMU | abbreviation for atomic mass unit |
| mass number | sum of protons and neutrons |
| isotopes | members of a family of an element that all have the same number of protons but different numbers of neutrons |
| atomic mass unit | a unit of mass for expressing masses of atoms |
| atomic mass | average weighted masses of all an element's isotopes |
| electrons | found in shells /orbits that surround nucleus of the atom |
