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Atomic Structure - Coggle Diagram
Atomic Structure
Key Terms
proton: Positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element. It weighs 1 amu.
neutron: A subatomic particle forming part of the nucleus of an atom. It has no charge. It is equal in mass to a proton or it weighs 1 amu.
atom: The smallest possible amount of matter which still retains its identity as a chemical element, consisting of a nucleus surrounded by electrons.
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Key Points
Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams, which scientists define as one atomic mass unit (amu) or one Dalton.
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An atom is composed of two regions: the nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus.
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Subatomic Particles
Neutrons
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Different isotopes of an element have the same number of protons but vary in the number of neutrons present in their respective nuclei.
Electrons
Due to the relatively negligible mass of electrons, they are ignored when calculating the mass of an atom.
Protons
The total number of protons in the atoms of an element is always equal to the atomic number of the element.
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