Nickel atom can lose two electrons to form `Ni^(2+)` ion. The atomic number of nickel is 28. From which orbital will nickel lose two electrons?

Explanation

To determine from which orbital nickel (Ni) loses two electrons to form the Ni²⁺ ion, we can follow these steps:

### Step 1: Identify the Atomic Number
The atomic number of nickel (Ni) is 28. This means that a neutral nickel atom has 28 electrons.

### Step 2: Write the Electronic Configuration
The electronic configuration of nickel can be written as follows:
- 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸
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