These exercises are not divided by category, although they are roughly in the order of the topics in the chapter. They are not paired.
The diameter of a rubidium atom is 4.95 Å. We will consider two different ways of placing the atoms on a surface. In arrangement A, all the atoms are lined up with one another to form a square grid. Arrangement B is called a close-packed arrangement because the atoms sit in the “depressions” formed by the previous row of atoms:
(a) Using arrangement A, how many Rb atoms could be placed on a square surface that is 1.0 cm on a side? (b) How many Rb atoms could be placed on a square surface that is 1.0 cm on a side, using arrangement B? (c) By what factor has the number of atoms on the surface increased in going to arrangement B from arrangement A? If extended to three dimensions, which arrangement would lead to a greater density for Rb metal?
February 08-12 Chemistry 121 Chapter 3 Notes: Atoms and Ionic Bonds: Ions, Molecules, and Chemical Bonds: - Atoms in molecules are bonded together by covalent bonds- which result from sharing two or more electrons between two atoms (nonmetals) Ionic Compounds: Made of charged particles called ions (one metal + one nonmetal) - Gains/loses electrons - Held together by the attraction of positive and negative charges Molecules: Made up of two or more nonmetals Diatomic Molecules: These elements exist naturally as two atoms of each element bonded with one covalent bond (you can remember these elements using BrINClHOF) - Bromine (Br ) 2 - Iodine (I2) - Nitrogen (N 2 - Chlori