Discussion
The CORRECT order of electronegativity is
Answer: D
The correct order is S \(\gt\) P \(\gt\) Si \(\gt\) Al.
Across a period, electronegativity rises with nuclear charge, because the atoms shrink and hold their valence electrons more tightly. Al, Si, P and S are consecutive third-period elements, so electronegativity increases in that order; the Pauling values are roughly Al 1.6, Si 1.9, P 2.2, S 2.6.
Al \(\gt\) Si \(\gt\) P \(\gt\) S is the exact reverse. The two mixed orders put Si above P or P below Al, which no scale supports.
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