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28 Cards in this Set
- Front
- Back
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The smallest unit of an element that retains the chemical properties of that element.
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Atom
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The dense, positively charged structure found in the center of the atom.
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Nucleus
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What subatomic particles are found in the nucleus of an atom?
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Protons & Neutrons
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Where are electrons located in an atom?
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The electron cloud
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A subatomic particle with a positive charge, found in the nucleus of atoms.
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Protons
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A subatomic particle with a negative charge
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Electron
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A subatomic particle that does not have a charge, found in the nucleus of atoms
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Neutron
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The number of protons in the nucleus of an atom of an element.
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Atomic Number
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Where is the atomic number located on the periodic table?
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Above the element's symbol.
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What makes up most of the mass of the atom?
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The nucleus (protons and neutrons)
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What makes up most of the volume of an atom?
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The electron cloud.
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How do you calculate the number of nuetrons in an atom?
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Neutrons = Atomic mass - protons
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How do you calculate the atomic mass of an atom?
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Atomic Mass = protons + neutrons
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Atoms of the same element that have different numbers of neutrons.
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Isotopes
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In a neutral atom the number of electrons is equal to?
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The number of protons.
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The weighted average of the masses of the isotopes in a sample of an element.
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Average Atomic Mass
(found under the element's symbol on the periodic table) |
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What is the difference between Carbon-12 and Carbon 14?
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Different number of neutrons. They are isotopes.
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The radioactive or unstable elements on the periodic table have a an atomic number greater than?
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84 (bismuth)
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Any isotope that has an unstable nucleus and decays over time
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Radioactive Isotope
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A process that involves changes to the nucleus of an atom.
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Nuclear Reaction
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The joining of two nuclei to form a larger nucleus accompanied by a release of energy.
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Fusion
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The splitting apart of an atomic nucleus into two smaller nuclei accompanied by a release of energy.
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Fission
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Alpha Particle
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Beta Particle
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A nuclear reaction in which an atom emits an alpha particle.
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Alpha Decay
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A nuclear reaction in which a neutron changes into a proton, and the atom emits a beta particle.
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Beta Decay
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What happens to the atomic number and mass number of an atom that ungergoes alpha decay?
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Its atomic number decreases by 2, and its mass number decreases by 4.
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What happens to the atomic number and mass number of an atom that undergoes beta decay?
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The atomic number increases by 1and the mass number does not change.
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