question 7\nchoose the ground state electron configuration for cr³⁺.\nar3d³\nar4s¹3d²\nar4s²3d⁶\nar\nar4s²3d¹
question 7\nchoose the ground state electron configuration for cr³⁺.\nar3d³\nar4s¹3d²\nar4s²3d⁶\nar\nar4s²3d¹
Answer
Explanation:
Step1: Determine Cr's atomic number
Chromium (Cr) has an atomic number of 24.
Step2: Write Cr's ground - state electron configuration
The ground - state electron configuration of Cr is $[Ar]4s^{1}3d^{5}$ due to the stability of half - filled d - orbitals.
Step3: Consider the $Cr^{3 + }$ ion
$Cr^{3+}$ has lost 3 electrons. First, 1 electron is removed from the 4s orbital and 2 from the 3d orbitals. So the electron configuration of $Cr^{3+}$ is $[Ar]3d^{3}$.
Answer:
[Ar]3d³