Electron Gain Enthalpy Quiz

What is electron gain enthalpy?

• The energy change when an electron is removed from a gaseous atom.

• The energy change when an electron is added to a neutral gaseous atom.

• The energy change when a proton is added to a gaseous atom.

• The energy change when a neutron is added to a gaseous atom.

When is electron gain enthalpy considered positive?

• When energy is released upon electron addition.

• When energy is absorbed upon electron addition.

• When no energy change occurs.

• When the atom becomes more stable.

How does atomic size affect electron gain enthalpy?

• Larger atomic size results in more negative electron gain enthalpy.

• Smaller atomic size results in less negative electron gain enthalpy.

• Larger atomic size results in less negative electron gain enthalpy.

• Atomic size has no effect on electron gain enthalpy.

What is the role of effective nuclear charge in electron gain enthalpy?

• Lower effective nuclear charge results in more negative electron gain enthalpy.

• Higher effective nuclear charge results in less negative electron gain enthalpy.

• Effective nuclear charge does not affect electron gain enthalpy.

• Higher effective nuclear charge results in more negative electron gain enthalpy.

What is the screening effect?

• The effect of outer electrons shielding inner electrons from the nucleus.

• The effect of inner electrons shielding outer electrons from the nucleus.

• The effect of neutrons shielding electrons from the nucleus.

• The effect of protons shielding electrons from the nucleus.

Why do some elements have positive electron gain enthalpy?

• Because they have a fully filled or half-filled subshell.

• Because they have a large atomic size.

• Because they have a low screening effect.

• Because they have a high effective nuclear charge.

Which element in Group 17 has the highest negative electron gain enthalpy?

• Iodine

• Bromine

• Chlorine

• Fluorine

What happens to electron gain enthalpy as you move down a group?

• It becomes positive.

• It remains the same.

• It becomes less negative.

• It becomes more negative.

Why is the second electron gain enthalpy always positive?

• Due to decreased atomic size.

• Due to increased electron-electron repulsions.

• Due to increased nuclear attraction.

• Due to decreased effective nuclear charge.

What is the electron gain enthalpy for adding a second electron to an already negative ion?

• Always negative

• Always zero

• Always positive

• Sometimes positive, sometimes negative