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| the basic unit of a chemical element. |
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| the central and most important part of an object, movement, or group, forming the basis for its activity and growth. |
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Definition
| a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids. |
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Definition
| a part or aspect of something abstract, esp. one that is essential or characteristic. |
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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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| a thing that is composed of two or more separate elements; a mixture. |
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| a chemical bond in which one atom loses an electron to form a positive ion and the other atom gains an electron to form a negative ion |
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Definition
| an atom or molecule with a net electric charge due to the loss or gain of one or more electrons. |
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Definition
| a chemical bond that involves sharing a pair of electrons between atoms in a molecule |
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Definition
| a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction. |
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