10. Periodic Properties of the Elements

Which of the following species has the electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6?

Which of the following is the correct electron configuration for argon (Ar)?

Which of the following represents the correct orbital diagram for platinum (Pt, atomic number 78)?

Which of the following electron configurations for a neutral carbon atom represents an excited state?

Which of the following electron configurations correctly represents the placement of electrons around a nitrogen atom?

Which one of the following is the correct electron configuration for a ground-state nitrogen atom?

When an electron moves from a higher energy orbital (state a) to a lower energy orbital (state b), what is most likely to occur?

Which element has the electron configuration 1s2 2s2 2p6 3s1?

Which of the following is the correct electron configuration for a neutral phosphorus (P) atom?

Which element has an electron configuration of 2–5, and how many protons does its atom contain?

After the 4d sublevel is completely filled, which electron sublevel begins to fill next?

Which statement about the electron-cloud model is true?

Which of the following represents the correct orbital diagram for the ion Mo^{3+}?

How many electrons are present in a neutral atom of silicon (Si)?

Which of the following is the correct electron configuration for bromine (Br)?