A monoatomic anion of unit charge contains 45 neutrons and 36 electrons. Find the atomic number, mass number of the ion with its identification.

Explanation

To solve the problem of finding the atomic number, mass number, and identification of a monoatomic anion with 45 neutrons and 36 electrons, we can follow these steps:

### Step 1: Identify the number of electrons and the charge of the anion
- Given that the anion has a unit charge (−1) and contains 36 electrons, we can determine the number of protons.
- Since the anion has a negative charge, it means it has gained one extra electron compared to the number of protons.

### Step 2: Calculate the number of protons
- The number of protons (atomic number, Z) can be calculated as follows:
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