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25 Cards in this Set
- Front
- Back
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atom
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the smallest particle of an element that retains its identity in a chemical reaction
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compound
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a sustance that contains 2 or ore elements combined in a fixed porportion
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electrons
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a negativly charged subtomic particles
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cathode ray
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a stream of electrons produced at the negative cathode of a tube containing gas at low pressure
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protons
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a possitivly charged subtomic particle found in the nucleus of an atom
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neutrons
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a subtomic particle with no charge and a mass of one atom, composed of protons and electrons
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nucleus
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the tiny dense central portion of an atom copsed of protons and neutrons
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atomic number
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the number of protons in the nucleus
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mass number
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the total number of protons and neutrons in the nucleus of an atom
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isotope
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atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom
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average atomic mass
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the weighted average of the isotopes in an element
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atomic mass unit
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one twelfth the mass of carbonatom having six protons and six neutrons
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atomic emission spectrum
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frequencys of light emitted by an element
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frequency
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number of wave cycles passing a point per unit of time
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quantum
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package of energy
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aufbau principle
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tendency of electrons to enter orbitals of lowest energy first
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pauli exlusion principle
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each orbital has at the most two electrons
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heisenburg uncertainty priciple
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fill the orbitals before you finish
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ground state
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an electrons lowest state
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electron configuration
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arrangement of electrons around the nucleus
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periodic law
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a repetition of properties occurs when elements are arranged in order of increasing atomic number
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in the bohr mode3l of the atom, an electron in an orbit has a fixed ----
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energy
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what is the energy required to remove an electron from an atom in the gaseous state
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ionization
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why did jj thomson reason that electrons must be part of the atoms of all elements
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charge to mass ratio of electrons was the same, regardless of the gased used
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which of the following is correct concerning subtomic particles
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the neutrons dicovered by chadwick 1932
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