10. Periodic Properties of the Elements

How many electrons can the n = 4 shell hold in an atom?

Which of the following electron configurations represents an atom of calcium (atomic number 20) in an excited state?

Which of the following is the correct electron configuration for calcium (atomic number 20)?

Which of the following electron configurations is possible for a nitrogen atom in an excited state?

Which one of the following is the correct orbital diagram for a nitrogen atom (atomic number 7)?

Which of the following is the correct electron configuration for tin (Sn)?

Which of the following represents the correct orbital diagram for a neutral nickel atom (atomic number 28)?

Which of the following is true about the electron configurations of the noble gases?

Which of the following ions has the electron configuration 1s^2 2s^2 2p^6?

Which of the following represents the correct electron configuration for a neutral atom of nickel (atomic number 28)?

Which element is represented by the electron configuration 1s^2 2s^2 2p^2?

Why do chemists use the electron cloud or charge density model to describe electrons in atoms?

Which of the following is the correct electron configuration for the sodium ion, Na$^+$?

Which of the following best describes how an electron can move from a lower energy shell to a higher energy shell?

Which of the following is the correct ground-state electron configuration for a neutral lead (Pb) atom?