Structure of Atoms

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What is an atom?
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An atom is the smallest unit of matter that retains the identity of a chemical element.
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What are the three main subatomic particles?
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The three main subatomic particles are protons, neutrons, and electrons.
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Where are protons located in an atom?
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Protons are located in the nucleus of an atom.
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What is the charge of an electron?
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An electron has a negative charge.
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How does the number of protons in an atom's nucleus relate to its identity?
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The number of protons determines the atomic number and identity of the element.
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Where are electrons found in an atom?
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Electrons are found in electron clouds or shells surrounding the nucleus.
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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 significance of the atomic number?
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The atomic number identifies the element and determines its position on the periodic table.
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What particle is responsible for the majority of an atom’s mass?
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The majority of an atom’s mass is due to protons and neutrons, which are located in the nucleus.
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What is the atomic mass of an atom?
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Atomic mass is the weighted average mass of an atom’s isotopes, measured in atomic mass units (amu).
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Can the number of neutrons in an atom vary?
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Yes, variation in the number of neutrons forms different isotopes of the same element.
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What is a model often used to describe the electron arrangement in an atom?
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The Bohr model is commonly used for representing the electron arrangement with energy levels.
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What is a valence electron?
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A valence electron is an outer shell electron that is involved in chemical bonding.
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Why are noble gases stable?
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Noble gases are stable because they have a full valence shell of electrons.
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What determines the chemical properties of an atom?
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An atom’s chemical properties are primarily determined by its electron configuration, especially the valence electrons.
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