2.12 (a) What electron subshell is being filled for the rare earth series of ele
ID: 2993879 • Letter: 2
Question
2.12 (a) What electron subshell is being filled for the rare earth series of elements on the peri- odic table?
(b) What electron subshell is being filled for the actinide series?
2.17 The net potential energy EN between two ad- jacent ions is sometimes represented by the expression
E ????C??Dexpa??rb (2.12)
in which r is the interionic separation and C, D, and r are constants whose values depend on the specific material.
(a) Derive an expression for the bonding en- ergy E0 in terms of the equilibrium interionic separation r0 and the constants D and r using the following procedure:
1. Differentiate EN with respect to r and set the resulting expression equal to zero. 2.SolveforCintermsofD,r,andr0. 3. Determine the expression for E0 by substitution for C in Equation 2.12.
(b) Derive another expression for E0 in terms of r0, C, and r using a procedure analogous to the one outlined in part (a)
2.21 Using Table 2.2, determine the number of co- valent bonds that are possible for atoms of the following elements: silicon, bromine, nitrogen, sulfur, and neon.
2.22 What type(s) of bonding would be expected for each of the following materials: solid xenon,
calcium fluoride (CaF2), bronze, cadmium tel-luride (CdTe), rubber, and tungsten?
Explanation / Answer
What electron subshell is being filled for the rare earth series of elements on the periodic table?
(b) What electron subshell is being filled for the actinide series?
(a) The 4f subshell is being filled for the rare earth series of elements.
(b) The 5f subshell is being filled for the actinide series of elements.
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