Textbook Question
Repeat Exercise 12.51 for a linear chain of eight lithium atoms. (f) How does the HOMO–LUMO energy gap for this case compare to that of the four-atom case?
331
views
Ch.12 - Solids and Modern Materials
Chapter 12, Problem 55
Arrange the following metals in increasing order of expected melting points: Mo, Zr, Y, Nb. Explain this trend in melting points.
Verified step by step guidance1
Step 1: Understand the concept of melting points in metals. Melting points are influenced by the strength of metallic bonds, which depend on factors such as atomic size, electron configuration, and the number of valence electrons.
Step 2: Consider the position of each metal in the periodic table. Molybdenum (Mo), Zirconium (Zr), Yttrium (Y), and Niobium (Nb) are all transition metals, and their properties can be compared based on their group and period.
Step 3: Analyze the electron configuration of each metal. Transition metals have partially filled d-orbitals, and the number of electrons in these orbitals can affect the strength of metallic bonding.
Step 4: Compare the atomic sizes of the metals. Generally, smaller atoms can pack more closely together, leading to stronger metallic bonds and higher melting points.
Step 5: Arrange the metals based on the analysis of their atomic size, electron configuration, and position in the periodic table to determine the trend in melting points.
Related Practice
Textbook Question
Which would you expect to be the more ductile element, (a) Ag or Mo? In each case explain your reasoning.
563
views
Textbook Question
Which of the following statements does not follow from the fact that the alkali metals have relatively weak metal–metal bonding? (a) The alkali metals are less dense than other metals. (b) The alkali metals are soft enough to be cut with a knife. (c) The alkali metals are more reactive than other metals. (d) The alkali metals have higher melting points than other metals. (e) The alkali metals have low ionization energies.
674
views
Textbook Question
For each of the following groups, which metal would you
expect to have the highest melting point: (b) rubidium, molybdenum, or indium?
792
views
Textbook Question
Tausonite, a mineral composed of Sr, O, and Ti, has the cubic unit cell shown in the drawing. (a) What is the empirical formula of this mineral?
755
views
Textbook Question
The unit cell of a compound containing Co and O has a unit
cell shown below. The Co atoms are on the corners, and the O
atoms are completely within the unit cell. What is the empirical
formula of this compound? What is the oxidation state of
the metal?
668
views