Atomic Theory & Atomic Structure

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What is Atomic Theory?

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Atomic Theory is a scientific theory that states that matter is composed of discrete units called atoms. It explains the nature of atoms, their structure, and how they interact with each other.

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What are the three main subatomic particles?

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The three main subatomic particles are protons (positively charged), neutrons (neutral), and electrons (negatively charged).

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How do you calculate the number of neutrons in an atom?

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Number of Neutrons = Atomic Mass - Atomic Number.

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What is an ion?

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An ion is a charged atom that has either lost or gained one or more electrons, resulting in a positive (cation) or negative (anion) charge.

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What is an isotope?

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Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.

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What is the atomic number?

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The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

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What is atomic mass?

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Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

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What is the electron cloud?

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The electron cloud is a region around the nucleus of an atom where electrons are likely to be found, representing the probabilistic nature of electron positions.

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What is the charge of a neutron?

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A neutron has no charge; it is neutral.

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What is the charge of an electron?

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An electron has a negative charge.