Which among the following pairs of elements have maximum and minimum electron affinity values respectively?
Which among the following pairs of elements have maximum and minimum electron affinity values respectively?
The correct option is D Cl, Cs
Explanation for Correct option:
Option- D) Chlorine(Cl) is the element with highest electron affinity in the periodic table because of the presence of 7melectrons in the valence shell and by gaining an electron attains Argon configuration.
Caesium(Cs) is the element with least electron affinity as it belongs to IA group with high electro positivity which means a greater tendency to lose an electron to attain Xenon configuration.
Explanation for Incorrect options:
Electron affinity: The amount of energy released when an electron is added to neutral, gaseous, isolated atom.
Option -A
Be- belongs to IIA group as they have two electrons extra in the valence shell than the inert gas configuration.It has high electron affinity compared to its group members So, it tends to lose electrons due to extra electrons.
Cl- is the element with high electron affinity belonging to VIIA group.
Option -B
He- is an inert gas element with zero electron affinity as they do not react with any other element.
K - belongs to IA group and it would rather lose an electron than gain an electron since it has 1 electron in the valence sh.
Option -C
Be- belongs to IIA group with least electron affinity as they have two electrons extra in the valence shell than the inert gas configuration.So, they tend to lose electrons readily.
S- belongs to VIA group with 6 valence electrons, they gain 2 electrons to get stability but the tendency of VIIA group elements is more as they only need 1 electron.
Hence, D) is the correct option - Cl-has maximum electron affinity and Cs has minimum electron affinity.
Cl, Cs
Explanation for Correct option:
Option- D) Chlorine(Cl) is the element with highest electron affinity in the periodic table because of the presence of 7melectrons in the valence shell and by gaining an electron attains Argon configuration.
Caesium(Cs) is the element with least electron affinity as it belongs to IA group with high electro positivity which means a greater tendency to lose an electron to attain Xenon configuration.
Explanation for Incorrect options:
Electron affinity: The amount of energy released when an electron is added to neutral, gaseous, isolated atom.
Option -A
Be- belongs to IIA group as they have two electrons extra in the valence shell than the inert gas configuration.It has high electron affinity compared to its group members So, it tends to lose electrons due to extra electrons.
Cl- is the element with high electron affinity belonging to VIIA group.
Option -B
He- is an inert gas element with zero electron affinity as they do not react with any other element.
K - belongs to IA group and it would rather lose an electron than gain an electron since it has 1 electron in the valence sh.
Option -C
Be- belongs to IIA group with least electron affinity as they have two electrons extra in the valence shell than the inert gas configuration.So, they tend to lose electrons readily.
S- belongs to VIA group with 6 valence electrons, they gain 2 electrons to get stability but the tendency of VIIA group elements is more as they only need 1 electron.
Hence, D) is the correct option - Cl-has maximum electron affinity and Cs has minimum electron affinity.
