2. Given their electron configurations, identify the following elements and specify in what group of the periodic table do they belong: (a) [A13d104s24p4(b) [Rn]7s²(c) [Kr]4d10(d) [A]4s²3d8 3. Group the species that are isoelectronic: Be2+, F, Fe2+, N³-, He, S2', Co3+, Ar. 4. Two atoms have the electron configurations 1s2s2p6 and 1s22s2p63s1. The first ionization energy of one is 2080 kJ/mol, and that of the other is 496 kJ/mol. Pair each ionization energy with one of the given electron configurations. Justify your choice. 5. The bonds in beryllium hydride (BeH2) molecules are polar, and yet the dipole moment of the molecule is zero. Explain. 6. Predict and draw the molecular geometries (show bond angles) for these molecules: a. BH3 b. BrCl3 c. CF4

2. Given their electron configurations, identify the following elements and specify in what group of the periodic table do they belong: (a) [A13d104s24p4(b) [Rn]7s²(c) [Kr]4d10(d) [A]4s²3d8 3. Group the species that are isoelectronic: Be2+, F, Fe2+, N³-, He, S2', Co3+, Ar. 4. Two atoms have the electron configurations 1s2s2p6 and 1s22s2p63s1. The first ionization energy of one is 2080 kJ/mol, and that of the other is 496 kJ/mol. Pair each ionization energy with one of the given electron configurations. Justify your choice. 5. The bonds in beryllium hydride (BeH2) molecules are polar, and yet the dipole moment of the molecule is zero. Explain. 6. Predict and draw the molecular geometries (show bond angles) for these molecules: a. BH3 b. BrCl3 c. CF4

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter2: Atomic Structure And Periodicity

Section: Chapter Questions

Problem 158CWP

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Similar questions

Consider the following ionization energies for aluminum: Al(g)Al+(g)+eI1=580kJ/molAl+(g)Al2+(g)+eI2=1815kJ/molAl2+(g)Al3+(g)+eI3=2740kJ/molAl3+(g)Al4+(g)+eI4=11,600kJ/mol a. Account for the trend in the values of tbe ionization energies. b. Explain the large increase between I3 and I4
The electron affinity of the lutetium atom (element 71) was measured using the technique of photoelectron spectroscopy with an infrared laser (the essay on p. 310 describes this instrumental method, using X rays). In this experiment, a beam of lutetium negative ions, Lu, was prepared and irradiated with a laser beam having a wavelength at 1064 nm. The energy supplied by a photon in this laser beam removes an electron from a negative ion, leaving the neutral atom. The energy needed to remove the electron from the negative ion to give the neutral atom (both in their ground states) is the electron affinity of lutetium. Any excess energy of the photon shows up as kinetic energy of the emitted electron. If the emitted electron in this experiment has a kinetic energy of 0.825 eV, what is the electron affinity of lutetium?
The electron affinities, in kJ>mol, for the group 1B and group2B metals are as follows: (a) Why are the electron affinities of the group 2B elementsgreater than zero? (b) Why do the electron affinities of thegroup 1B elements become more negative as we move downthe group? [Hint: Examine the trends in the electron affinitiesof other groups as we proceed down the periodic table.]
7.119 The first four ionization energies of an element areapproximately 738, 1450, 7.7 × 103 , and 1.1 × 104kJ/mol.To which periodic group does this element belong?Explain your answer.
Silver and rubidium both form +1 ions, but silver is far lessreactive. Suggest an explanation, taking into account theground-state electron configurations of these elements andtheir atomic radii.
Despite the expected decrease in atomic size, there is an unexpected drop in IE1 values between Groups 2A(2) and 3A(13) in Periods 2 through 4. Explain this pattern in terms of electron configurations and orbital energies.
Describe and account for the variation of first ionizationenergies along Period 2 of the periodic table . Would you expect the same variation in Period 3?
The alkali metal with an electron configuration of [Xe] 6s¹ is:
I need help with this question that is attached. Table 1.4 gave the ionic radii in pm. For k+ it was 138(6), 151(8),159(10) and for f- it was 128(2), 132(4), 133(6). Table 1. 5 gave ionization energies in kj/mol. For k they were 419, 3051 and 4410. For f it was 1681,3375, and 6050. Table 1.6 gave electron affinities in kj/mol and for k it was 48 and for f it was 328. I've also attached the resource table
Boron, atomic number 5, occurs naturally as two isotopes, 10B and 11B, with natural abundances of 19.9% and 80.1%, respectively.(a) In what ways do the two isotopes differ from each other? Does the electronic configuration of 10B differ from that of 11B? (b) Drawthe orbital diagram for an atom of 11B. Which electrons are the valence electrons? (c) Indicate three ways in which the 1s electrons inboron differ from its 2s electrons. (d) Elemental boron reacts with fluorine to form BF3, a gas. Write a balanced chemical equation forthe reaction of solid boron with fluorine gas. (e) ΔHf° for BF31g2 is -1135.6 kJ>mol. Calculate the standard enthalpy change in thereaction of boron with fluorine. (f) Will the mass percentage of F be the same in 10BF3 and 11BF3? If not, why is that the case?

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