Same chapter3 marksDifficulty: Medium
An element X has atomic number 12. Write its electronic configuration, its group and the formula of its chloride.
Periodic Properties and Variations of Properties
3 marksDifficulty: Medium
Define electron affinity and electronegativity, and state how each varies down a group.
Original Khojo Papers practice question — not from a past board paper.
Answer
Electron affinity is the energy released when a neutral gaseous atom gains an electron to form an anion. Electronegativity is the tendency of an atom in a molecule to attract the shared pair of electrons towards itself. Both decrease down a group, because the atom grows larger and the added or shared electrons are further from the nucleus.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Fluorine is the most electronegative element.
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