Chemistry - PERIODIC TABLE Question with Solution | TestHub

(A) H⁺ → Smallest cation

• H⁺ has no electrons, just a bare proton.
• Clearly smaller than any other cation.

(B) He → Maximum ionization energy

• He has highest effective nuclear charge per electron among neutral atoms.
• First IE = 24.6 eV → highest among elements.

(C) F → Maximum electron affinity

• F has high EA, but Cl has higher EA (periodic trend: EA generally increases across period, peaks in group 17, often Cl > F due to electron-electron repulsion in small F atom).

(D) Cl → Maximum electronegativity

• Electronegativity peaks at F, not Cl.