Why is the electron gain enthalpy of Oxygen or Fluorine less negative than that of the succeeding el

Q: What is the correct answer for CBS11?

The correct answer is B. When an electron is added to O or F, it goes to the smaller n=2 quantum level and suffers significant repulsion from other electrons already present. For n=3 elements (S or Cl), the added electron occupies a larger region of space, and electron-electron repulsion is much less.

Q: Why is the electron gain enthalpy of Oxygen or Fluorine less negative than that of the succeeding elements (S or Cl) in their respective groups?

The correct answer is B. When an electron is added to O or F, it goes to the smaller n=2 quantum level and suffers significant repulsion from other electrons already present. For n=3 elements (S or Cl), the added electron occupies a larger region of space, and electron-electron repulsion is much less.

Q: What are the options for this CBS11 question?

A. They have larger atomic sizes. · B. The added electron goes to a smaller n=2 quantum level and suffers significant repulsion. · C. They have higher effective nuclear charges. · D. They have completely filled p-orbitals.

Question

Why is the electron gain enthalpy of Oxygen or Fluorine less negative than that of the succeeding elements (S or Cl) in their respective groups?

FirstInTest · Accepted Answer

When an electron is added to O or F, it goes to the smaller n=2 quantum level and suffers significant repulsion from other electrons already present. For n=3 elements (S or Cl), the added electron occupies a larger region of space, and electron-electron repulsion is much less.

Answer

They have larger atomic sizes.

Answer

The added electron goes to a smaller n=2 quantum level and suffers significant repulsion.

Answer

They have higher effective nuclear charges.

Answer

They have completely filled p-orbitals.

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