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1. The two main regions of an atom are the
A. principal energy levels and energy sublevelsB. nucleus and kernelC. nucleus and energy levelsD. planetary electrons and energy levelsE.
2. The lowest principal quantum number that an electron can have is
A. 0B. 1C. 2D. 3E.
3. The sublevel that has only one orbital is identified by the letter
A. sB. pC. dD. fE.
4. The sublevel that can be occupied by a maximum of 10 electrons is identified by the letter
A. dB. fC. pD. sE.
5. An orbital may never be occupied by
A. 1 electronB. 2 electronsC. 3 electronsD. 0 electronsE.
6. An atom of beryllium consists of 4 protons, 5 neutrons, and 4 electrons. The mass number of this atom is
A. 13B. 9C. 8D. 5E.
7. The number of orbitals in the second principal energy level, n = 2, of an atom is
A. 1B. 9C. 16D. 4E.
8. Lewis structure consists of the symbol representing the element and an arrangement of dots that usually shows
A. the atomic numberB. the atomic massC. the number of neutronsD. the electrons in the outermost energy levelE.
9. Chlorine is represented by the Lewis structure . The atom that would be represented by an identical electron-dot arrangement has the atomic number
A. 7B. 9C. 15D. 19E.
10. Radioactive changes differ from ordinary chemical changes because radioactive changes
A. involve changes in the nucleusB. are explosiveC. absorb energyD. release energyE.
11. Isotopes of uranium have different
A. atomic numbersB. atomic massesC. numbers of planetary electronsD. numbers of protonsE.
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