Data Interpretation and Analysis Exercise 9.135: Lattice Energies of Period 4 El
ID: 1054750 • Letter: D
Question
Data Interpretation and Analysis Exercise 9.135: Lattice Energies of Period 4 Elements Evidence for the additional stabilization of certain electron configurations comes from the experimental lattice energies of the metal fluorides - MF_2. Figure 1 (Figure 1) plots lattice energy for the 2 + metal cations for period 4 elements. Figure 2 (Figure 2) plots the ionic radii of the 2 + metal cations for period 4 elements versus atomic number. Use the information provided in the figures to answer the following questions. Explain the general trend in lattice energy observed in Figure 1 and the general trend in atomic radius observed in Figure 2 by completing the statements below. Match the words and chemical formulas in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.Explanation / Answer
1) Moving from left to right across the 4 periode the lattice energy generally becomes MORE -ve.Becouse As we go from left to right the size of metal decreases which couses increase in force of attration between atmoms & therefore more -ve lattice energy.
2) Moving from left to right across the 4 periode, size of of atomic radius DECREASES. Becouse. Moving from left to right across the 4 periode one extra electron added in last shell of atom. Due to which the inward pull of electron increses & atrraction between nucleous increases which couses decrease in size.
3) Two metal cations & there ionic compounds notably deviates from observed trend and thse are Mn & Zn.
Becouse, Mn the last electron enters in Eg orbital whic couses lower in lattice energy.
In Zn last shell is completely filled.
4) Metal that follows the trend have Ti valence 3d subshell.
Ti( Z = 22 ) = 1s2 2s2 2p6 3s2 3p6 3d4
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