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Ch.8 - Basic Concepts of Chemical Bonding
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.8 - Basic Concepts of Chemical BondingProblema 23a
Capitolo 8, Problema 23a

The substances NaF and CaO are isoelectronic (have the same number of valence electrons). (a) What are the charges on each of the cations in each compound?

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Identify the ions present in NaF and CaO. NaF consists of Na^+ and F^- ions, while CaO consists of Ca^2+ and O^2- ions.
Determine the electron configuration of each ion. Na^+ has the same electron configuration as Ne, and F^- also has the same electron configuration as Ne. Similarly, Ca^2+ has the same electron configuration as Ar, and O^2- also has the same electron configuration as Ar.
Recognize that isoelectronic species have the same number of electrons. Na^+ and F^- are isoelectronic with Ne, and Ca^2+ and O^2- are isoelectronic with Ar.
Identify the charges on the cations. In NaF, the cation is Na^+ with a charge of +1. In CaO, the cation is Ca^2+ with a charge of +2.
Conclude that the charges on the cations are +1 for Na^+ in NaF and +2 for Ca^2+ in CaO.

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Isoelectronic Species

Isoelectronic species are atoms, ions, or molecules that have the same number of electrons. In the case of NaF and CaO, both compounds contain ions that achieve a stable electron configuration similar to noble gases, which is crucial for understanding their chemical behavior and bonding.
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Amphoteric Species

Cation Formation and Charge

Cations are positively charged ions formed when an atom loses one or more electrons. The charge of a cation is determined by the number of electrons lost; for example, sodium (Na) loses one electron to form Na⁺, while calcium (Ca) loses two electrons to form Ca²⁺. Understanding this helps in determining the charges of the cations in NaF and CaO.
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Enthalpy of Formation

Ionic Compounds and Charge Balance

Ionic compounds are formed from the electrostatic attraction between cations and anions, which must balance to create a neutral compound. In NaF, Na⁺ pairs with F⁻, while in CaO, Ca²⁺ pairs with O²⁻. Recognizing how these charges balance is essential for identifying the charges on the cations in each compound.
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Ionic Compounds Naming
Pratica correlata
Domanda del libro di testo

NaCl and KF have the same crystal structure. The only difference between the two is the distance that separates cations and anions. (a) The lattice energies of NaCl and KF are given in Table 8.1. Based on the lattice energies, would you expect the Na─Cl or the K─F distance to be longer?

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Domanda del libro di testo

NaCl and KF have the same crystal structure. The only difference between the two is the distance that separates cations and anions. (b) Use the ionic radii given in Figure 7.8 to estimate the Na─Cl and K─F distances.

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Domanda del libro di testo

(c) Would you expect salts like NaCl, which have singly charged ions, to have larger or smaller lattice energies compared to salts like CaO which are composed of doubly-charged ions?

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Domanda del libro di testo

The substances NaF and CaO are isoelectronic (have the same number of valence electrons). (b) What are the charges of each of the anions in each compound?

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Domanda del libro di testo

The substances NaF and CaO are isoelectronic (have the same number of valence electrons). (c) Without looking up lattice energies, which compound is predicted to have the larger lattice energy?

Domanda del libro di testo

The substances NaF and CaO are isoelectronic (have the same number of valence electrons). (d) Using the lattice energies in Table 8.1, predict the lattice energy of ScN.

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