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Element & Period tbl
Elements and the periodic table.
| Question | Answer |
|---|---|
| Atoms | tiney units that determine the properties of all matter |
| Nucleus | center of an atom. Positive electric charge. |
| Proton | positive charge. found in the nucleus. subatomic particle |
| Neutron | subatomic particle. no charge. found in nucleus. |
| Electrons | subatomic particles. negitive charge. determines chemical change. found in outher most shell of an atom. |
| Quantum particles | atoms are made of protons neutrons and electrons. |
| Chemical symbol | a way to write the name of an element. |
| Chemical property | a characteristic of a substance that indicates whether it can undergo a specific chemical change. |
| Electron cloud | region where electrons most probably are found surrounding the nucleus of an atom. |
| Element | substance in which all the atoms in a sample are alike. |
| Colloid | a heterogeneous mixture containing tiny particles that never settle out; example: milk and gelatin |
| Chemical change | the change of substances to different substances. |
| Periodic table | a table of the elements arranged according to repeated changes in properties. |
| Period | a horizontal row in the periodic table. |
| Physical change | a change in the size, shape, color, or state of matter. |
| Physical property | any charcteristic of a material that can be observed without changing the identity of the material itself. |
| Solution | a homogeneous mixture containing particles so tiny that you cant even see them, particles in a solution dont settle and dont scatter light. |
| Suspension | a heterogeneous mixture conatining a liquid in which larger particles eventually settle out. |
| Substance | matter that is an element or compound |
| Quark | very small particles of matter that make up protons and neutrons; 6 different types of quark are known. |
| Tyndell effect | the scattering of light by particles in a mixture; this can be seen in all colloids. |
| Mass number | sum of the number of protons and neutrons in an atoms nucleus. |
| Isotope | atoms of the same element that have different numbers of neutrons. |
| Atomic mass/weight | the number of protons in an atoms nucleus. |
| Coagulation | process that destroys colloid structure. |
| Compound | substance made of the combinded atoms of two or more elements. |
| Metal | elements ushually having these common properties: shiny, good conductors of heat and electricity, are solids at room temp. In the periodic table periodic table, metals are found at the left of the stair-step line. |
| Group | in the periodic table, each group is made up of elements with similar properties. |
| Metalloids | elements having properties of both metals and nonmetals. |
| Nonmetals | elements that usually are gases or brittle solids at room temperature. |
| Heterogeneous mixture | a mixture in which different parts can be easily distinguished. |
| Homogeneous mixture | a mixture in which different materials are blended evenly so that the mixture is the same throughout |
| Ions | a positively or negatively charged atom. |
| Law of conservation of mass | a law stating that matter is neither created nor distroyed during a chemical change. |
Created by:
nicolecaron
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