| Question |
Answer |
| Anything that has volume and mass |
Matter |
| Smallest unit of an element |
Atom |
| Small, dense center of an atom composed of protons and neutrons |
Nucleus |
| Positively charged subatomic particle located in the nucleus of atoms |
Proton |
| A subatomic particle located in the nucleus of atoms that has no charge |
Neutron |
| A negatively charged subatomic particle located in energy levels around the nucleus of atoms |
Electron |
| The electrons in the outermost energy level of an atom |
Valence electron |
| The basic building blocks of matter and are composed of just one type of atom |
Element |
| The number of protons in the nucleus of an atom which identifies the element |
Atomic Number |
| The mass of an atom which is the total number of protons and neutrons in the nucleus of an atom |
Mass number |
| The average mass of all the isotopes of an element |
Atomic Mass |
| Each verticle column of elements on the periodic table |
Family/group |
| Each horizontal row of elements on the periodic table |
Period |
| A property of matter that describes a substance based on its ability to change into a new substance with different properties |
Chemical property |
| A property of matter that can be observed or measured without changing the identiy of the matter |
Physical property |
| A change that occurs when one or more substances are changed into entirely new substances with differenct properites. |
Chemical change |
| A change that affects the siz, shape, phase or color of a substance but does not affect is composition. The same substance or substances remain. No new ones are formed |
Physical change |
| Elements that are shiny, ductile, and malleable and are good conductors or thermal energy and electrical current |
Metals |
| Elements that are not shiny and are poor conductors of thermal energy and electric current |
Non-metals |
| Elements that have properties of both metals and nonmetals; sometimes referred to as semiconductors. |
Metalloids |
| Materials that reduce or inhibit the transfer of thermal energy and electric current |
Insulators |
| Materials that conduct thermal energy and electric current very well |
Conductors |
| The process by which one or more substances change to produce one or more different substances |
Chemical reaction |
| A chemical reaction which absorbs heat energy |
Endothermic chemical reaction |
| A chemical reaction in which heat energy is released. |
Exothermic chemical reaction |
| A shorthand or abbreviated way to write the name of a chemical element |
Chemical symbol |
| A shorthand description that uses chemical formulas to describe a chemical reaction. |
Chemical equation |
| The starting substance or substances in a chemical reaction |
Reactants |
| The substance or substances that are formed in a chemical reaction |
Products |
| A charged particle that forms during chemical changes when one or more valence electrons transfer from one atom to another |
Ions |
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