Atoms, Ions, and Isotopes Review

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What is an atom?

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An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus containing protons and neutrons, surrounded by electrons in an electron cloud.

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What is an ion?

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An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net electrical charge. Cations are positively charged ions, while anions are negatively charged.

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

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To calculate the number of neutrons, subtract the atomic number (number of protons) from the atomic mass (rounded to the nearest whole number).

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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 and its position on the periodic table.

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What is the role of electrons in an atom?

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Electrons are negatively charged particles that orbit the nucleus of an atom. They are involved in chemical bonding and determine the atom's reactivity.

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What is the nucleus of an atom?

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The nucleus is the central part of an atom, containing protons and neutrons. It is positively charged due to the presence of protons.

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What charge does a neutron have?

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A neutron has no charge; it is neutral.

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What is the Bohr model of the atom?

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The Bohr model is a representation of the atom that depicts electrons orbiting the nucleus in fixed paths or energy levels.

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What is the significance of the atomic mass?

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The atomic mass is the weighted average mass of an element's isotopes, reflecting the relative abundance of each isotope.