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Atom Structure

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Class Work

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An atom is the smallest unit of an element that maintains all of the chemical and physical properties of that element. Atoms are made up of subatomic particles called protons, neutrons, and electrons.Protons and neutrons are located in the nucleus of an atom. These tiny subatomic protons and neutrons have nearly identical masses and their combined mass determines the mass of the atom.Electrons are located outside of the nucleus of an atom in an area called the electron cloud. Since the electron cloud takes up space, electrons contribute to the volume of an atom. Electrons are so small that their presence does not significantly change the mass of the atom.Protons have a positive electrical charge and electrons have a negative electrical charge. Neutrons have a no electrical charge. When an atom has the same number of protons and electrons the electrical charges cancel out so the atom, as a whole, does not have an electrical charge.

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An atom is the smallest unit of an element that maintains all of the chemical and physical properties of that element. Atoms are made up of subatomic particles called protons, neutrons, and electrons.Protons and neutrons are located in the nucleus of an atom. These tiny subatomic protons and neutrons have nearly identical masses and their combined mass determines the mass of the atom.Electrons are located outside of the nucleus of an atom in an area called the electron cloud. Since the electron cloud takes up space, electrons contribute to the volume of an atom. Electrons are so small that their presence does not significantly change the mass of the atom.Protons have a positive electrical charge and electrons have a negative electrical charge. Neutrons have a no electrical charge. When an atom has the same number of protons and electrons the electrical charges cancel out so the atom, as a whole, does not have an electrical charge.

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Vocabulary of the topic

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Subatomic Particles

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What are the subatomic particles that compose an atom?