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| Law of conservation of mass |
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Definition
| conservation of mass: a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system. |
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| Law of definite proportions |
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Definition
| law stating that every pure substance always contains the same elements combined in the same proportions by weight |
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| Law of multiple proportions- |
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Definition
law stating that when two elements can combine to form more than one compound the amounts of one of them that combines with a fixed amount of the other will exhibit a simple multiple relation
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Definition
| The basic unit of a chemical element |
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Definition
| A strong attractive force between nucleons in the atomic nucleus that holds the nucleus together |
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Definition
| A unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 x 10-27 kg |
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Definition
| The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table |
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Definition
Atomic weight (symbol: A) is a dimensionless physical quantity, the ratio of the average mass of atoms of an element (from a given source) to 1/12 of the mass of an atom of carbon-12 (known as the unified atomic mass unit).
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Definition
The number of atoms or molecules in one mole of a substance, equal to 6.023 × 1023
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Definition
Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element
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Definition
| The total number of protons and neutrons in a nucleus |
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Term
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Definition
| Molar mass, symbol M, is a physical property characteristic of a given substance (chemical element or chemical compound), namely its mass per amount of substance. The base SI unit for mass is the kilogram and that for amount of substance is the mole. |
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Definition
| The SI unit of amount of substance, equal to the quantity containing as many elementary units as there are atoms in 0.012 kg of carbon-12 |
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Term
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Definition
| A distinct kind of atom or nucleus characterized by a specific number of protons and neutrons. |
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