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PeriodicTable/Natali
| Term | Definition |
|---|---|
| Periodic Table | the chart scientists use to organize and classify all the known elements |
| Element | a pure substance that cannot be broken down into simpler substances by chemical reactions |
| Element Symbol | a symbol that represents the element, usually one or two letters |
| Atomic Number | the number of protons in the nucleus of an atom; atomic number determines the chemical properties of the atom |
| Atomic Mass | The combined mass of all of the protons and neutrons of an atom. Since each proton and neutron has a mass of approximately one unit (called an atomic mass unit) the atomic mass is approximately equal to the number of protons and neutrons. |
| Period | a horizontal row on the periodic table |
| Group | a vertical column on the periodic table |
| Family | a group |
| Chemical Formula | a group of chemical symbols and numbers that shows the number of atoms of each element in a molecule |
| Metals | an element that conducts heat and electricity well, is shiny, and can be hammered into sheets or drawn into wires |
| Nonmetals | an element that does not conduct heat or electricity well and is dull and brittle or gaseous |
| Metalloids | an element that has some properties of both metals and nonmetals |
| Noble Gases | the six elemental gases that does not naturally react with other elements |
| Reactivity | the tendency of a substance to undergo chemical changes |
| Dmitri Mendeleev | Russian chemist who developed a periodic table of the chemical elements and predicted the discovery of several new elements |
| Trend(patterns on the periodic table) | specific patterns found in the periodic table, includes patterns in size and electronic properties |
| Energy Level | the energy level increases as the number of electrons increases and the atom needs more electron shells |
| Valence Electrons | an electron that is associated with an atom, and that can participate in the formation of a chemical bond |
| Chemical Property | a characteristic of a substance that cannot be observed without changing the identity oft he substance |
| Physical Property | a characteristic of a substance that can be observed directly or measured with a tool without changing the identity of the subsance |
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NatCal2020
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