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An atom is the basic unit of matter.
A nucleus is the center of an atom, which contains the protons and neutrons in cells, structure that contains the cell's genetic material in the form of DNA. |
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An electron is the negatively charged particle located in the space surrounding the nucleus.
An element is a pure substance that consists entirely of one type of atom. |
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An isotope is one of several forms of a single element, which contains the same number of protons but different numbers of neutrons.
A compound is a substance formed by the chemical combination of two or more elements in definite proportions. |
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| An ionic bond is the chemical bond formed when one or more electrons are transferred from one atom to another. |
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| An ion is an atom that has a positive or negative charge. |
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A covalent bond is a type of bond between atoms in which the electrons are shared.
A molecule is the smallest unit of most compounds that displays all the properties of that compound. |
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| The van der Waals force is the slight attraction that develops between oppositely charged regions of nearby molecules. |
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