Consider the complex ion [Zn(NH₃)₄]²⁺.

i. Identify the oxidation number for Zn in the complex.

ii. Given that [Zn(NH₃)₄]²⁺ is a diamagnetic ion with a tetrahedral geometry, provide the electron configuration of Zn in this complex.

iii. Write the systematic name for [Zn(NH₃)₄]²⁺.

Draw the crystal field energy-level diagram for the below-given tetrahedral complex. How many unpaired electrons are present?

• [MnBr₄]²⁻