Electrons and Quantum Theory - SAT Subject Test in Chemistry
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Which of the following has the electron configuration of 
?
Which of the following has the electron configuration of
The task is to find the atom or ion with its first three energy levels completely filled. Argon is not an answer choice, which means that it must be one of the ions with an atomic number close to argon's atomic number. Recalling that a positive charge means electrons were lost from the outermost shell and that a negative charge means electrons were gained in the outermost shell, the only answer that works is 
.
The task is to find the atom or ion with its first three energy levels completely filled. Argon is not an answer choice, which means that it must be one of the ions with an atomic number close to argon's atomic number. Recalling that a positive charge means electrons were lost from the outermost shell and that a negative charge means electrons were gained in the outermost shell, the only answer that works is
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Which of the following variables identifies the sublevel that has three orbitals?
Which of the following variables identifies the sublevel that has three orbitals?
The 
sublevel contains three orbitals, whereas the other levels listed contain different numbers of orbitals. The 
level has one orbital; the 
level has five; the 
level has seven; and there is no 
sublevel.
The 
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