| A | B |
|---|
| Atom | Smallest structure of matter |
| Proton | Positive part of an atom, found in the nucleus |
| Neutron | Neutral part of an atom, found in the nucleus |
| Electron | Negative part of an atom, found in the electron cloud |
| Bohr Model | Model showing the location of protons, neutrons, and electrons in an atom |
| Nucleus | Center of an atom with the protons and neutrons |
| Electron Cloud | Outside of an atom where the electrons are found |
| Molecule | Structure of two or more atoms chemically combined |
| Orbital | Circular path around the nucleus of an atom where electrons are found |
| Mixture | A combination of two or more substances that are not chemically combined. |
| Pure Substance | A substance that only has one type of particle |
| Homogeneous Mixture | Type of mixture that is evenly mixes |
| Heterogeneous Mixture | Type of mixture that is not evenly mixes |
| Element | substance that is made entirely of one type of atom |
| Compound | Two or more elements chemically combined |
| Periodic Table | Chart that organizes the elements |
| Group | Column on the periodic table |
| Period | Row on the periodic table |
| Metal | Type of element that have few electrons in the outer orbitals and are mostly solid at room temperature |
| Nonmetal | Type of element that have almost a full set of valence electrons and is usually gas at room temperature |
| Metalloid | Type of element that has some properties of metals and some properties of nonmetals |
| Valence Electron | Electrons in the outermost orbital |
| Dmitri Mendeleev | Person who arranged the periodic table |
| Malleable | Ability to be pounded into thin sheets |
| Ductile | The ability to be drawn or pulled into wire |
| Brittle | Easily breakable |
| Conductor | Lets heat or electricity pass through it |
| Insulator | Does not let heat or electricity pass through it/ traps heat and electricity |
| Physical Property | Property that can be observed or measured without changing the identity of the matter. |
| Chemical Property | Property that describes a substance based on how it changes into new substances with different properties. |
| Characteristic Property | Property that stays the same no matter how much you have |
| Significant Digit | Accurate number of digits in a measurement |
| Volume | Amount of space an object occupies |
| Mass | Amount of matter in an object |
| Density | Amount of matter in a certain amount of space |
| Water Displacement Method | Method for finding the volume of an irregular solid |
| Physical Change | Change that affects one or more physical properties of a substance |
| Chemical Change | Change that occurs when one or more substances are changed into entirely new substances with different properties |
| Lewis Dot Structure | Symbols that show the valence electrons in an atom. |
