I Chem I  -  1st Problem Assignment  -  January 12, 1999

Study problems (not to be turned in):  R-C., Chapt. 1, pp. 15-16: 5, 7, 8, 12, 14, 15, 20;  
Chapt. 2, pp. 33-34: 11, 12. 
Problems from R-C. to be turned in on Friday, January 19, 1999:  
Chapt. 1: 3, 6, 11, 13, 16, 18, 19;  Chapt. 2: 9, 10.

Additional problems (also to be turned in on Jan. 19):
1.  An isotope of the element lead has a mass number of 207.  How many protons, neutrons and 
	electrons are there in this isotope?
2. How many protons, neutrons and electrons are present in: 
	87Sr2+, 39K, 83Kr, 127I- ?
3. a. Write out the names for the following elements: 
	Fe, B, Be, Cs, Ce, Cu, Cm, Ca, Cl, Cr, Sr, Sn, Sb, K, Pb, Pd, Tc, Ti, Tl, Te.
    b. Place these elements in one of the following three categories of relative terrestial abundance (in 
	either combined or native form): 
	(i) abundant (>103, rel to 106 Si atoms); (ii) intermediate (103 - 1); (iii) rare (<1 atom/106 Si)
4. (a) Which of the following set of quantum numbers represent permissible solutions of the 
	Schroedinger wave equation?
			n		l		m		s
			3		0		 1	        -1/2
			3		1		 1		1
			4		1		 4	         1/2
			5		6		 5	         1/2
			2	           -1	           -1	        -1/2
			4		2	           -2	         1/2		
			4		1		 0	        -1/2
			4		3		 4	         1/2
   (b) 	For each of the correct sets of quantum numbers give the orbital type 
	(s, p, d, f, etc.) and draw a picture which shows the general shape of the orbital.
5. Which of the following are isoelectronic with argon: Ne, S2-, Ca2+, Na+, Cl-, Ga3+?
6. Which of the following pairs are isoelectronic with neon: (a) O2- and F-, 
	(b) Li+ and Be2+, (c) O2- and Mg2+, (d) Al3+ and N3-, (e) P3- and Sc3+?
7. Give the electronic configurations of the following elements and the number of unpaired electrons 
	in each case: oxygen, aluminum, mercury, cadmium, scandium, lead.