Apentix/AP Chemistry/Unit 1: Atomic Structure and Properties/Question

AP Chemistrymediummcq1 pt

Which statement about electron affinity is correct?

A.It is the energy change when a gaseous atom gains an electron

B.It is always a positive energy change

C.It is identical to ionization energy

D.It measures an atom's pull in a covalent bond

Explanation

Core Concept

Electron affinity measures the energy change for X(g) + e⁻ → X⁻(g). Highly negative values (fluorine, chlorine) mean the atom releases a lot of energy accepting an electron.

Correct Answer

AIt is the energy change when a gaseous atom gains an electron

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