7th CK SCI Atomic Structure COMPLETE
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| amu | Atomic Mass Unit, the unit used to weigh subatomic particles
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| Atom | the smallest piece of matter
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| Atomic mass | the average of all the mass numbers of all the isotopes of an element that occurs in nature
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| Atomic number | the number of protons in the nucleus of an atom
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| Corpuscle | negative subatomic particle in the atom discovered by J.J. Thomson; today it is known as an electron
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| Electron cloud | the area surrounding the nucleus where electrons are found
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| Element | the simplest pure substance
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| Indirect evidence | evidence that is gained based on observation
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| Isotope | an atom of a given element with a different number of neutrons than protons
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| Mass number | the sum of the number of protons and neutrons contained in an atom’s nucleus
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| Matter | anything with mass and volume
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| Molecule | two or more atoms chemically bonded together
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| Neutron | subatomic particle with no charge located in the nucleus of the atom
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| Nucleus | the center of positive charge in the nucleus; discovered by Ernest Rutherford
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| Proton | subatomic particle with a positive charge located in the nucleus of the atom
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| Pure substance | a substance in which all particles are alike
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| Subatomic particle | particle smaller that the atom
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