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| The Basic unit of a chemical element (made up of protons, neutrons and electrons) |
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| extremely small negatively charged particle with a mass of 1/2000 of the mass of a hydrogen atom |
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| Small neutral particle which has the same mass as a proton (relative mass of 1) |
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| Small positively charged particle having a mass approximately equal to the mass of a hydrogen atom and a charge equal in magnitude |
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Definition
| The centre of an atom which contains protons and neutrons |
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| The number of protons in the nucleus of an atom of that element |
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| Number of protons plus neutrons in the nucleus of an atom of the species concerned |
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| Atoms of the one element that differ in the number of neutrons in their nuclei |
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| Average mass of the atoms present in the naturally occurring element relative to the mass of an atom of the carbon-12 isotope taken as exactly 12 |
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| Describes the wave-like behavior of either one electron or a pair of electrons in an atom |
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Definition
| New substance formed, difficult to reverse, a lot larger increase in energy, mass conserved |
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Definition
| No new substances are made, easy to reverse, relatively small energy change, mass conserved |
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| Cause to happen suddenly, unexpectedly, or prematurely (A substance precipitated from a solution) |
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