The atom of an element has 9 protons, 9 electrons and 10 neutrons.
Predict the valency of the element

Explanation

To predict the valency of the element with 9 protons, 9 electrons, and 10 neutrons, we can follow these steps:

### Step 1: Identify the Element
The number of protons in an atom determines the element. Since this atom has 9 protons, it is fluorine (F).

### Step 2: Determine the Electron Configuration
The electron configuration of fluorine can be determined by distributing the electrons in the shells:
- The first shell (K shell) can hold a maximum of 2 electrons. Therefore, 2 electrons will fill the K shell.
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