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WorksheetsElectron Affinity-Recap
Total questions: 10
Worksheet time: 10mins
The electron affinity values (in kJ mol-1) of three halogens X, Y and Z are respectively -349, -333 and -325. Then X, Y and Z respectively are:
F, Cl and Br
Cl, F and Br
Cl, Br and F
Br, Cl and F
The formation of the oxide ion O2-(g) requires first an exothermic and then an endothermic step - as shown below:
O(g) + e- ====> O-(g) ; ΔH0= -142 kJ mol-1
O-(g) + e- ====> O2-(g) ; ΔH0= +844 kJ mol-1
This is because?
oxygen is more electronegative
oxygen has high electron affinity
O - ion will tend to resist the addition of another electron
O - ion has comparatively larger size than oxygen atom
Which of the following is correct about general trends regarding electron affinity?
Electron affinity increases down a group and decreases across a period.
Electron affinity increases from bottom to top and decreases from left to right.
Electron affinity increases from bottom to top and increases from left to right.
Electron affinity decreases from bottom to top and increases from left to right in a period
Which of the given atoms has the lowest electron affinity?
Sr
Be
Ca
Ra
Which element would experience the greatest energy loss when a neutral atom in the gaseous phase gains one additional electron?
Lithium
Fluorine
Chlorine
Krypton
Atoms have characteristic electronegativities and electron affinities. Which of the following best describes the difference between these two terms?
Electronegativity describes the potential an atom has to give up its electrons, whereas electron affinity describes the potential an atom has to gain electrons
Electronegativity describes an atom's tendency to retain its current electron configuration, while electron affinity describes an atom's tendency to accept electrons
Electronegativity describes an atom's tendency to accept electrons, while electron affinity describes an atom's tendency to retain its current electron configuration
Electronegativity and electron affinity are two terms describing the same atomic phenomenon
When the atomic radius increases, electron affinity
Decreases
Increases
Neutral
No effect
The value of electron affinity is always negative
True
False
When the force of attraction decreases, electron affinity ?
remains same
increases
decreases
doubles
Which of the following has the highest electron affinity
F-
O-
O
Na
