(b) Element X has the electronic configuration 1s22s 2p 3s2 3p. (i) State the block of the periodic table where the element can be found. (ii) The element forms the ion X-. Complete the electronic configuration of the X- ion. 1s 25 2p° 3s² 3p .....
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- In the crystal structure of CsCl (cesium chloride), Cs + ions form the base of a cube while a Cl− ion occupies its center (see Figure 1). Each edge of the cube measures 0.4 nm. Each electron lacks Cs + ions (therefore, the charge of each is + e), while the Cl− ion has one in excess (therefore its charge is -e). (a) What is the magnitude of the resulting electrostatic force exerted by the eight Cs + on the Cl− ion? (b) If one of the Cs + ions is missing, the crystal is said to be imperfect. What is the magnitude of the resulting electrostatic force that the seven Cs + ions then exert on the Cl− ion?Use principles of atomic structure to answer each of the following: (1] (a) The radius of the Ca atom is 197 pm; the radius of the Ca2* ion is 99 pm. Account for the difference. (b) The lattice energy of CaO(s) is –3460 kJ/mol; the lattice energy of K20 is –2240 kJ/mol. Account for the difference. (c) Given these ionization values, explain the difference between Ca and K with regard to their first and second ionization energies. Element First lonization Energy (kJ/mol) Second lonization Energy (kJ/mol) K 419 3050 Ca 590 1140 (d) The first ionization energy of Mg is 738 kJ/mol and that of Al is 578 kJ/mol. Account for this difference.Which of the following is the correct representation of partial charges at the indicated atoms? a. I = δ+; II = δ–; III = δ– b. I = δ–; II = δ–; III = δ– c. I = δ+; II = δ+; III = δ+ d. I = δ–; II = δ+; III = δ– e. I = δ+; II = δ–; III = δ+
- Mixing SbCl3 and GaCl3 in a 1;1 molar ratio (usingliquid sulfur dioxide as a solvent) gives a solid ioniccompound of empirical formula GaSbCl6. A controversyarises over whether this compound is ( ) SbCl2 + ( ) GaCl 4 - or( ) GaCl+ 2 ( ) SbCl 4 -(a) Predict the molecular structures of the two anions.(b) It is learned that the cation in the compound has abent structure. Based on this fact, which formulationis more likely to be correct?Which set of ionic compounds shows the correct order of increasing lattice energy (lowest-to-highest). (A) NaCl < NaF < KCl < KBr; (B) KBr < KCl < NaCl < NaF; (C) NaF < NaCl < KCl < KBr; (D) KCl < KBr < NaF < NaCl.1) Using principles of chemical bonding and/or intermolecular forces, explain each of the following. (a) Xenon has a higher boiling point than neon has. (b) Solid copper is an excellent conductor of electricity, but solid copper chloride is not. (c) SiO2 melts at a very high temperature, while CO2 is a gas at room temperature, even though Si and C are in the same chemical family. (d) Molecules of NF3 are polar, but those of BF3 are not. 2) Using principles of chemical bonding and/or intermolecular forces, explain each of the following: (a) MgCl2 and SiCl4 (b) MgCl2 and MgF2 (c) F2 and Br2 (d) F2 and N2 Note: Please Briefly Explain
- The atomic number of sulfur is 16. Sulfur combines withhydrogen by covalent bonding to form a compound, hydrogensulfide. Based on the number of valence electrons in a sulfuratom, predict the molecular formula of the compound.(A) HS(B) HS2(C) H2S(D) H4STo test Döbereiner’s idea , predict:(a) The boiling point of HBr from the boiling points of HCl(-84.9°C) and HI (-35.4°C) (actual value -67.0°C) (b) The boiling point of As H₃ from the boiling points of PH₃(-87.4°C) and SbH₃(-17.1°C) (actual value 55°C)Iodine monochloride and elemental bromine have nearly the same molar mass and liquid density but very different boiling points. (a) What molecular property is primarily responsible forthis difference in boiling point? What atomic property gives rise to it? Explain. (b) Which substance has a higher boiling point?Why?
- NaCl and KF have the same crystal structure. The only differencebetween the two is the distance that separates cationsand anions. (a) The lattice energies of NaCl and KF are givenin Table 8.1. Based on the lattice energies, would you expectthe Na¬Cl or the K¬F distance to be longer? (b) Use theionic radii given in Figure 7.8 to estimate the Na¬Cl andK¬F distances.For many years after they were discovered, it was believed that the noble gases could not form compounds. Now we know that belief to be incorrect. A mixture of xenon and fluorine gases, confined in a quartz bulb and placed on a windowsill, is found to slowly produce a white solid. Analysis of the compound indicates that it contains 77.55% Xe and 22.45% F by mass.(a) What is the formula of the compound?(b) Write a Lewis structure for the compound.(c) Predict the shape of the molecules of the compound.(d) What hybridization is consistent with the shape you predicted?An element X reacts with oxygen to form XO2 and with chlorineto form XCl4. XO2 is a white solid that melts at high temperatures(above 1000 °C). Under usual conditions, XCl4 is acolorless liquid with a boiling point of 58 °C. (a) XCl4 reactswith water to form XO2 and another product. What is thelikely identity of the other product? (b) Do you think thatelement X is a metal, nonmetal, or metalloid?