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Unit 4 vocabulary
| Term | Definition |
|---|---|
| Atomic Mass | average mass of one atom of an element |
| Periodic Table | a chart where elements are organized into periods and groups according to their properties |
| Chemical Symbol | one-or-two-letter code that stands or an element; Many symbols are abbreviations are the element's name |
| Period | a row of elements in the periodic table arranged by atomic number |
| Group | column of elements in the periodic table, in which elements have certain properties in common |
| Matter | the material that all objects and substances are made of |
| Element | substances that are the building blocks of all matter |
| Compound | matter made of 2 or more elements |
| Atom | smallest particle into which an element can be divided and still have the properties of that element |
| Electron | negatively charged particle found outside the nucleus of an atom |
| Nucleus | center of an atom, made up of protons and neutrons |
| Proton | positively charged particle located in the nucleus of an atom |
| Neutron | in an atom, particle with a neutral charge; located in the nucleus |
| Energy Level | the amount of energy carried by an electron in an atom |
| Isotope | atoms of the same element with different numbers of neutrons in the nucleus, and thus different atomic masses |
| Mass Number | the integer nearest in value to the atomic weight of an atom and equal to the number nucleons in the nucleus of an atom |
| Atomic Number | the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus |
| Metal | such a substance in its pure state, as distinguished from alloys |
| Malleable | capable of being extended or shaped by hammering or by pressuring from rollers |
| Ductile | capable of being hammered out thin, as certain metals |
| Conductivity | the property or power of conducting heat, electricity, or sound |
| Reactivity | the relative capacity of an atom, molecule, or radical to go to undergo a chemical reaction with another atom, molecule or compound |
| Corrosion | way in which acids react with some metals so as to eat away the metal |
| Alkali Metal | any of the group univalent metals including potassium, sodium, lithium, rubidium, cedium, and francium, whose hydroxides are alkalis |
| Alkaline Metal | any of the group of bevalent metals including barium, radium, strontium, calcium, and, usually, magnesium, the hydroxides of which are alkalis but less soluble than those of the alkali metals |
| Transition Metal | any element in any of the series of elements with atomic numbers 21-29, 39-47, 57-79, and 89-107, that in a given inner ortibal has less than a full quota of electrons |
| Alloy | a substance composed of two or more metals, or of a metal or metals with a nonmetal, intimately mixed, as by fusion or electrodeposition |
| Nonmetal | an element not having the characteristic of metal, as carbon or nitrogen |
| Diatomic Molecule | made of two or more atoms |
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frenchfry13
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