Atomic Theory & Atomic Structure

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Discovered the electron within the atom

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Thomson is credited with the discovery of the electron, demonstrating that atoms are not indivisible but contain smaller particles.

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Proposed the Modern Electron Cloud Model of the atom

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Schrodinger & Heisenberg developed the Modern Electron Cloud Model, which describes electrons as existing in probabilistic clouds around the nucleus.

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Value representing the number of protons in an element

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Atomic Number is the number of protons in the nucleus of an atom, which defines the element.

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Measure mainly of the nuclear particles: protons + neutrons

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Mass Number is the total number of protons and neutrons in an atom's nucleus.

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Subatomic particles with a positive charge

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Protons are positively charged subatomic particles found in the nucleus of an atom.

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The smallest unit of an element that retains its properties

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An atom is the smallest unit of an element, consisting of protons, neutrons, and electrons.

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Neutral subatomic particles found in the nucleus

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Neutrons are neutral particles that reside in the nucleus of an atom and contribute to its mass.

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The negatively charged subatomic particles that orbit the nucleus

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Electrons are negatively charged particles that orbit the nucleus of an atom in electron shells.

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The model that describes the atom as having a dense nucleus surrounded by electrons

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The Nuclear Model, proposed by Rutherford, describes the atom as having a small, dense nucleus surrounded by orbiting electrons.

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The concept that matter is made up of small indivisible particles

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The Particle Theory of Matter states that all matter is composed of tiny particles that are in constant motion.