WAEC - Chemistry (1994 - No. 25)
Which of the following reactions is accompanied by the first ionization energy of an element X?
X +(aq) → X 2+ (aq) + e-
X - (g) → X(g) + e-
X+ (g) → X2+ +e-
X (g) → X+ (g) +e-
X(s) → X + (g) + e-
Explanation
ionization energy (IE) is the minimum energy required to remove an isolated gaseous atom's most loosely bound electron. The first ionization energy is quantitatively expressed as
\(X_{(g)} + energy ⟶ X^+_{(g)} + e^−\)
where X is any atom or molecule, \(X^+\) is the resultant ion when an electron( \(e^−\)) was removed from the original atom.
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