Unit 7 Electronic Structure Problem Set

Unit 7 – Electronic Structure Problem Set

Given the following list of atomic and ionic species, find the appropriate match for questions 1 – 4. a) Fe2+ b) Cl c) K+ d) Cs e) Hg+

1. Has the electron configuration 1s22s22p63s23p63d6. 2. Has a noble gas electron configuration. 3. Has electrons in f orbitals 4. Is isoelectronic with gold

5. Which of the following combinations of particles represents an ion net charge of -1 and has a mass number of 82? a) 46 neutrons, 35 protons, 36 electrons b) 46 neutrons, 36 protons, 35 electrons c) 46 neutrons, 36 protons, 36 electrons d) 47 neutrons, 35 protons, 35 electrons e) 47 neutrons, 35 protons, 36 electrons

6. For a neutral As atom in the ground state, how many electrons have quantum numbers n = 4, l = 1? a) 2 b) 3 c) 4 d) 5 e) 6

7. Which electron configuration is impossible? a) 1s22s22p6 b) 1s22s22p3 c) 1s22s22p63s1 d) 1s22s22p63s2 e) 1s22s22p62d2

8. Which set of quantum numbers (n,l,ml,ms) represents the outermost electron in an aluminum atom? a) 2, 1, 0, +½ b) 2, 1, -1, +½ c) 3, 0, 0, +½ d) 3, 1, -1, +½ 9. Which species is paramagnetic in the gaseous state? a) Cr+3 b) Zn+2 c) Sn+2 d) Al+3

10. How many unpaired electrons are found in the ground state of a sulfur atom? a) 0 b) 2 c) 4 d) 6

11. The most stable electron configuration for Mn+2 is: a) [Ar] 4s23d3 b) [Ar] 3d5 c) [Ar] 4s13d5 d) [Ar] 4s13d4

12. What is the wavelength of radiation emitted from a mercury arc sunlamp if the frequency of the radiation is about 1.2 x 1015 sec-1? (c = 3.0 x 1010 cm/sec) a) 2.0 x 10-5 cm b) 4.0 x 10-4 cm c) 2.5 x 10-6 cm d) 2.5 x 10-5 cm

13. The 1st line in the hydrogen spectrum is dark purple with a wavelength of 410.18 nm. Calculate:

a) the frequency of this light

b) the change in energy that produces this color (h = 6.626 x 10-34 J.s/ particle) (c = 3.0 a 108 m/sec)

14. An electron in a hydrogen atom gets excited to the 3rd energy level and then falls to back down to the1st energy level.

a) How much energy was released from this transition?

b) What is the frequency of this transmission? c) What is the wavelength of this transmission in nanometers?

d) Would you be able to see the color of this transmission?

Periodic Table and Properties- Problem Set

1. Which of the following would not produce a colored solution? a) CuNO3 (aq) b) KMnO4 (aq) c) FeCl3 (aq) d) ZnBr2 (aq)

2. Which of the following would have the smallest atomic radius? a) Li b) Na c) Mg d) Be

3. Which of the following would be the smallest in size? a) Na+ b) Mg+2 c) F- d) Ne

4. Which of the following metals could only be produced by electrolysis of one of its salts? a) Li b) Al c) Bi d) Co

5. Explain why The ionization energy of Group 2 generally decreases down the group, but the ionization energy of period 2 generally increases across the period? 6. Why is the 2nd ionization energy of sodium much greater then the second ionization energy of magnesium?

7. Which metal in period 3 would have the lowest 3rd ionization energy and why?