TTU General Chemistry

1. In predicting the electron configuration of the elements by the Aufbau Principle, to which sublevel is one adding electrons in traversing from element 39, Y, to element 48, Cd?

2. The number of valence electrons in the Group including nitrogen, phosphorus, and arsenic is:

3. Of the 3 elements fluorine, bromine, and calcium, which has the highest and which the lowest ionization energy?

4. Rank the following five atomic species in order of increasing atomic radius (smallest to largest): Si, Na, K, F, O

5. The hydride ion has ____ electrons.

6. Which ionic species would you predict to be the largest? Na⁺, Mg²⁺, N^3-, O^2-

7. The Mg²⁺ ion is isoelectronic with which neutral atom?

8. Between which two species out of the following three elements is there the largest electronegativity difference? O, Se, Mg

9. Identify the INCORRECT statement below:

10. Which of the following is NOT true of the compound K2O?

11. Which of the following processes is responsible for the yellowish-brown gas commonly found in the air over large metropolitan areas?

12. Which Lewis Dot Formula below is INCORRECT?

13. What is the total number of available valence electrons in the Lewis dot structure of the ammonium ion, NH₄⁺?

14. The Lewis dot formula for Br₂ shows:

15. Which is the correct Lewis dot structure of magnesium chloride?

16. Based on the Lewis electron dot structure of the diatomic molecule O₂, what kind of bond exists between the oxygen atoms?

17. Which is the correct Lewis structure of the SO₃^2- ion?

18. In which species is there a violation of the octet rule?

19. Which of the following statements about chemical periodicity is INCORRECT?

KEY (corrected as of 10/22/97)