CHEM 141. Fall 2008 Name:_____________________________
Quiz 5 (Watts)
JSU id:_____________________________
This is a take-home quiz. It is to be turned in at the beginning of the final exam (2 p.m.
on December 11, 2008) or to the instructor’s office before then. A score of zero will be
recorded if it is not turned in on time. This quiz must be done individually. You may
consult your notes, the instructor’s web pages, the course textbook, or any other
chemistry book. If he has any suspicion that a student obtained assistance from someone
else, the instructor reserves the right to examine the student with a closed-book,
supervised quiz and record the score on that assignment instead of the score on this take-
home quiz.
1. (8 points)
Write the chemical symbols, electron configurations, and numbers of valence
electrons of the following elements. Use rare gas core notation.
Element Chemical
symbol
Electron configuration Number of valence
electrons
Calcium
Bromine
Silicon
Arsenic
2. (4 points)
(a) Give the symbols (include charges) of two monatomic cations that are
isoelectronic with Ar.
(b) Give the symbols (include charges) of two monatomic anions that are
isoelectronic with Kr.
(c) Which noble gas is isoelectronic with I- and Te2- ?
(d) Which noble gas is isoelectronic with Rb+ and Sr2+?
3. (4 points) Which of the following elements has the smallest ionization energy? And
which of the following elements has the largest ionization energy (IE)?
(a) F, B, Ne, O Smallest IE:_________ Largest IE:__________
