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Periodic Table
| Term | Definition |
|---|---|
| Matter | everything that has mass and takes up space. |
| Mass | The material matter is made of |
| Volume | how much room matter takes up |
| Density | ratio of the mass of a substance to its volume |
| atom | the smallest unit of a chemical element having the properties of that element |
| electron | elementary particle carrying a unit charge of negative electricity |
| proton | elementary particle having a single positive electrical charge |
| neutron | uncharged elementary particle of slightly greater mass than the proton |
| periodic table | large grid that classifies all the elements by their chemical and physical propeties |
| rows/periods | rows that tell you how many energy levels each element has |
| groups/columns | the number of electrons in the outer shell |
| valence electrons | the electrons that move on the outer shell of an atom |
| atomic number | the number of protons inside the nucleus |
| atomic mass | the measurement of mass for an element |
| chemical property | the ability of substances to combine and form new compounds |
| physical property | the state of matter and appearance of a substance |
| ionic bond | when elements lose or gain an electron suring bonding |
| covalent bond | elements share electrons during bonding |
| chemical change | elements bond together through the attractive force of the electrons |
| compound | two or more elements combine in a specific ratio |
| mixture | when two or more substances combine but do not make a new substance |
| nobel gases | all the elements in group number eighteen |
| halogen | all the elements in group number seventeen |
| alkali | all the elements in group number one |
| metalloids | elements found along the step like line between metals and non-metals of the periodic table. |