Biology Flashcards

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Atom

Back

The basic unit of matter

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Nucleus

Back

The center of an atom, containing protons and neutrons; in cells, it contains DNA

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Electron

Back

Negatively charged particles located in the space surrounding the nucleus

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Element

Back

A pure substance consisting entirely of one type of atom

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Isotope

Back

One of several forms of a single element with the same number of protons but different neutrons

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Compound

Back

A substance formed by the chemical combination of two or more elements in definite proportions

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Ionic bond

Back

A chemical bond formed when electrons are transferred from one atom to another

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Ion

Back

An atom with a positive or negative charge

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Covalent bond

Back

A type of bond between atoms where electrons are shared

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Molecule

Back

The smallest unit of most compounds displaying all properties of the compound