Modeling 'Atoms Vocabulary

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Matter

Back

Anything that has mass and takes up space.

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Element

Back

A substance that cannot be broken down into simpler substances by chemical means.

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Atomic Number

Back

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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Atomic Mass

Back

The mass of an atom, typically expressed in atomic mass units (amu).

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Atomic Theory

Back

A scientific theory about the nature of matter, which states that matter is composed of discrete units called atoms.

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Electron

Back

A subatomic particle with a negative electric charge, found in all atoms and acting as the primary carrier of electricity in solids.

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Valence Electron

Back

An electron in the outer shell of an atom that can combine with other atoms to form molecules.

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Proton

Back

A subatomic particle found in the nucleus of every atom that has a positive electric charge.

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Neutron

Back

A subatomic particle found in the nucleus of atoms that is neutral, meaning it has no electric charge.

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Hypothesize

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To make an educated guess or propose a theory based on limited evidence as a starting point for further investigation.