How many electrons can the shell with a principal quantum number of 1 hold?
2. How many electrons can the shell with a principal quantum number of 2 hold?
3. What is the ground-state electronic configuration of a nitrogen atom (nitrogen: atomic number 7)?
4. What is the ground-state electronic configuration of a fluorine atom (fluorine: atomic number 9)?
5. What is the ground-state electronic configuration of a fluoride anion (fluorine: atomic number 9)?
6. What is the ground-state electronic configuration of a sodium cation (sodium: atomic number 11)?
7. Which of the following species has an atom that has an unfilled valence shell of electrons?
A. molecular hydrogen, H2
B. hydroxide anion, HO-
C. boron trifluoride, BF3
D. water, H2O
8. Which of the following species has an atom that has an unfilled valence shell of electrons?
A. molecular bromine, Br2
B. fluoride anion, F-
C. ammonia, NH3
D. aluminum trichloride, AlCl3
9. Which of the following species possesses a formal charge?
10. Which of the following species possesses a formal charge?
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