| Term | Definition |
|---|
| energy level | a region of an atom in which electrons of the same energy are likely to be found |
| atomic number | the number of protons in the nucleus of an atom |
| isotope | an atom with the same number of protons as other atoms of that element, but a different number of neutrons |
| mass number | the sum of the protons and neutrons in the nucleus of an atom |
| periodic table | a chart of the elements that shows the repeating pattern in their properties |
| atomic mass | the average mass of all the isotopes of an element |
| valence electrons | those electrons in an atom that have the highest energy level and are held most loosely |
| ion | an atom or group of atoms with an electric charge |
| ionic compound | a compound that consists of positive and negative ions |
| covalent bond | the chemical bond formed when two atoms share electrons |
| molecule | a neutral group of atoms joined by covalent bonds |
| molecular compound | a compound composed of molecules |
| polar bond | a covalent bond in which electrons are shared unequally |
| matter | anything that has mass and takes up space |
| physical property | a characteristic of a substance that can be observed without changing the substance into another substance |
| chemical property | a characteristic of a substance that describes its ability to change into other substances |
| chemical reaction | a change in matter that produces one or more new substances |
| solution | a well-mixed mixture that contains a solvent and at least one solute |
| solvent | the part of a solution present in the largest amount; it dissolves the other substances |
| solute | a substance that is present in a solution in a smaller amount and is dissolved by the solvent |
| indicator | a compound that changes color when it comes in contact with an acid or base |
Combine with other sets
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