ATOMIC VOCABULARY
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| ISOTOPE | This is an atom of an element that has the same number of protons but different number of neutrons
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| ATOMIC MASS | is the average mass of the atoms of an element often expressed in atomic mass units (amu);
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| VALENCE ELECTRONS | the electrons found in the outermost energy level of an atom
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| ATOMIC NUMBER | number of protons in the nucleus of an atom.
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| MASS NUMBER | the sum of the protons and neutrons in the nucleus of an atom (m#=p+n)
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| PROTONS | the positively charged particles found in the nucleus of an atom
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| NEUTRONS | neutrally charged particles found in the nucleus of an atom
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| ELECTRONS | negatively charged particles found in the electron cloud surrounding the nucleus of an atom
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| 11 | the mass number is 20, what is the number of neutrons?
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| CALCIUM | What is the name of the element with 20 protons?
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| NUCLEUS | The dense, positively charged center of an atom is called the _
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| OXYGEN | Name this element: there's 2 electrons in 1st shell, 6 in second shell.
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| Yes, because the number of neutrons differs from # of protons. | If an element with atomic # 27 has 26 neutrons, is it an isotope? Explain choice
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| PHOSPHORUS (atomic #15) | Name this element: there's 2 electrons in 1st shell, 8 in second shell, and 5 in last shell.
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| J. J. THOMSON | Which scientist proposed the "plum pudding" model?
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| ELECTRONS | In a single neutral atom the number of protons equals the number of __
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| ION | a charged atom
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| JJ THOMSON | Discovered the electron
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| E. RUTHERFORD | PERFORMED GOLD FOIL EXPERIMENT AND FOUND THAT AN ATOM HAS A POSITIVELY CHARGED NUCLEUS
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| E. RUTHERFORD | His atomic model is nicknamed "nuclear" model
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| N. Bohr | stated that electrons are in specific orbits around nucleus (energy levels)
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| DEMOCRITUS | FIRST TO PROPOSE IDEA OF ATOM; SAID THEY WERE INDIVISIBLE
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| SCIENTIFIC MODEL | A representation of a system or phenomenon; it can be bigger or smaller than what it represents
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| electron cloud | where electrons in an atom are most likely to be found (outside nucleus)
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