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Definition
| The neutrons, protons, and electrons in an atom. |
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Definition
| The spontaneous emission of high-energy radiation and particles by materials. |
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Term
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Definition
| A radioactive emission that is a high-energy electron. |
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Term
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Definition
| A radioactive emission with a charge of 2+ and a mass equivalent to that of a helium nucleus. |
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Term
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Definition
| A subatomic particle that has a negative charge and essentially zero mass. |
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Term
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Definition
| The positively charged center of an atom that contains nearly all the atom's mass. |
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Term
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Definition
| A positively charged subatomic particle in the nucleus of an atom. |
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Term
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Definition
| An electrically neutral(uncharged) subatomic particle found in the nucleus of an atom. |
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Term
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Definition
| Unit used to express the relative masses of atoms and subatomic particles |
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Term
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Definition
| A unit of mass identical to 1 atomic mass unit. |
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Term
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Definition
| An atom or group of atoms that has a positive or negative charge. |
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Term
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Definition
| Atoms of an element containing the same number of protons but different numbers of neutrons. |
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Term
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Definition
| A specific isotope of an element. |
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Term
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Definition
| The number of protons in the nucleus of an atom. |
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Term
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Definition
| Either a proton or a neutron in a nucleus. |
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Term
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Definition
| The number of nucleons(protons&neutrons) in an atom. |
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Term
| Periodic Table of Elements |
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Definition
| A chart of the elements in order of their atomic numbers and in a pattern based on their physical and chemical properties. |
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Term
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Definition
| a weighted average of masses of all isotopes of an element. |
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Term
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Definition
| The proportion of a particular isotope, Usually expressed as a percentage, relative to all the isotopes of that element i a natural sample. |
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Term
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Definition
| The horizontal rows in the periodic table. |
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Term
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Definition
| All the elements in the same column of the periodic table. |
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Term
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Definition
| An element in group 17 of the periodic table. |
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Term
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Definition
| An element in group 1 of the periodic table. |
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Term
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Definition
| An element in group 2 of the periodic table. |
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Term
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Definition
| The elements on the left side of the periodic table that are typically shiny solids that conduct heat and electricity well and are malleable and ductile. |
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Term
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Definition
| Elements with properties opposite those of metals including poor conductivity of heat and electricity. |
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Term
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Definition
| Elements along the border of the periodic table between metals and nonmetals; they have some metallic and some nonmetallic properties. |
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Term
| Main Group Elements/Representative Elements |
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Definition
| The elements in groups 1,2,13-18 of the periodic table. "A" elements |
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Term
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Definition
| The elements in groups 3-12 of the periodic table. "B" elements |
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Term
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Definition
| The elements in group 18 of the periodic table. |
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Term
| Law of Multiple Proportions |
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Definition
| The ratio of the tow masses of one element that react with a given mass of another element to form two different cmpds is the ratio of two small whole numbers. |
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Term
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Definition
| A cmpd composed of atoms held together in molecules by covalent bonds. Bionary(two-element)nonmetal. |
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Term
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Definition
| A bond between two atoms created by sharing one or more pairs of electrons. |
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Term
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Definition
| A notation showing the number and type of atoms present in one molecule of a molecular cmpd. |
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Term
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Definition
| A cmpd composed of positively and negatively charged ions held together by electrostatic attraction. |
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Term
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Definition
| Positively charged particle created when an atom or molecule loses one or more electrons. |
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Term
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Definition
| Negatively charged particle created when an atom or molecule gains one or more electrons. |
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Term
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Definition
| A formula showing the smallest whole-number ratio of elements in a cmpd. |
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Term
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Definition
| The smallest electrically neutral unit of an ionic cmpd. |
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Term
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Definition
| Charged groups of two or more atoms joined together by covalent bonds. |
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Term
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Definition
| Polyatomic ions that contain oxygen in combination with one or more other elements. |
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Term
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Definition
| An organic cmpd containing the -COOH functional group. |
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Term
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Definition
| A structural subunit in organic molecules that imparts characteristic chemical and physical properties. |
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Term
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Definition
| Cmpds containing carbon, and commonly including certain other elements such as hydrogen, oxygen, and nitrogen. |
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