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Ch.8 - Basic Concepts of Chemical Bonding
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Brown 14th EditionCh.8 - Basic Concepts of Chemical Bonding문제 102b
8장, 문제 102b

One scale for electronegativity is based on the concept that the electronegativity of any atom is proportional to the ionization energy of the atom minus its electron affinity: electronegativity = k1I - EA2, where k is a proportionality constant. (b) Why are both ionization energy and electron affinity relevant to the notion of electronegativity?

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1
Step 1: Understand the concept of electronegativity. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. The higher the electronegativity, the greater the atom's strength to attract a pair of electrons.
Step 2: Understand the concept of ionization energy. Ionization energy is the energy required to remove an electron from an atom or ion. The higher the ionization energy, the more difficult it is to remove an electron.
Step 3: Understand the concept of electron affinity. Electron affinity is the energy change that occurs when an electron is added to a neutral atom. The higher the electron affinity, the more readily the atom can accept an electron.
Step 4: Understand the relationship between these concepts. Both ionization energy and electron affinity are relevant to the notion of electronegativity because they both reflect the behavior of an atom in relation to electrons. An atom with a high ionization energy and a high electron affinity will have a high electronegativity because it strongly resists losing electrons and readily accepts additional electrons.
Step 5: Understand the equation. In the equation electronegativity = k1I - EA2, the ionization energy (I) and electron affinity (EA) are both taken into account. The constant k is a proportionality constant that adjusts the scale of the electronegativity values. This equation shows that electronegativity is directly proportional to ionization energy and inversely proportional to electron affinity.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Ionization Energy

Ionization energy is the energy required to remove an electron from an atom in its gaseous state. It reflects how strongly an atom holds onto its electrons; higher ionization energy indicates a stronger attraction between the nucleus and the electrons. This concept is crucial for understanding electronegativity because atoms with high ionization energies tend to attract electrons more effectively, contributing to their electronegativity.
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가이드 코스
01:19
Ionization Energy

Electron Affinity

Electron affinity is the amount of energy released when an atom gains an electron to form a negative ion. It indicates how much an atom 'wants' to gain an electron; a higher electron affinity means the atom is more likely to attract additional electrons. This property is relevant to electronegativity as it helps determine how readily an atom can accept electrons, influencing its ability to form bonds with other atoms.
추천 영상:
가이드 코스
01:34
Electron Affinity

Electronegativity

Electronegativity is a measure of an atom's ability to attract and hold onto electrons in a chemical bond. It is influenced by both ionization energy and electron affinity, as these properties dictate how effectively an atom can gain or lose electrons. Understanding electronegativity is essential for predicting the behavior of atoms in chemical reactions and the nature of the bonds they form.
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가이드 코스
02:10
Electronegativity Trends
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교과서 질문

The electron affinity of oxygen is -141 kJ/mol, corresponding to the reaction O(g) + e- → O-(g). The lattice energy of K2O(s) is 2238 kJ/mol. Use these data along with data in Appendix C and Figure 7.10 to calculate the 'second electron affinity' of oxygen, corresponding to the reaction O-(g) + e- → O2-(g)

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교과서 질문

One scale for electronegativity is based on the concept that the electronegativity of any atom is proportional to the ionization energy of the atom minus its electron affinity: electronegativity = k1I - EA2, where k is a proportionality constant. (c) By using data in Chapter 7, determine the value of k that would lead to an electronegativity of 4.0 for F under this definition.

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교과서 질문

One scale for electronegativity is based on the concept that the electronegativity of any atom is proportional to the ionization energy of the atom minus its electron affinity: electronegativity = k1I - EA2, where k is a proportionality constant. (d) Use your result from part (c) to determine the electronegativities of Cl and O using this scale. Use your result to determine the electronegativity of Cl using this scale.

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