If the atomic weight of `Zn` in `70` and its atomic number in `30`, Then what be the atomic weight of `Zn^(2+)`?

Explanation

To determine the atomic weight of the zinc ion \( \text{Zn}^{2+} \), we will follow these steps:

### Step 1: Understand Atomic Weight and Atomic Number
- The atomic weight of an element is the sum of the number of protons and neutrons in its nucleus.
- The atomic number is the number of protons in the nucleus, which also equals the number of electrons in a neutral atom.

### Step 2: Identify Given Values
- The atomic weight of zinc (Zn) is given as 70.
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