Multiple choice

Al+3 is isoelectronic with

  1. Cl-

  2. Ar

  3. S--

  4. F-
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Isoelectronic species have the same number of electrons. Al+3 has atomic number 13, so it has 13-3=10 electrons. F- has atomic number 9, so it has 9+1=10 electrons. Cl- has 18 electrons, Ar has 18 electrons, and S-- has 18 electrons - none match Al+3's 10 electrons.

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