To fill the valence shell, an electrically neutral, unbonded atom with atomic number 8 must add ...

To fill the valence shell, an electrically neutral, unbonded atom with atomic number 8 must add ...

The answer is :

2 electrons because The neutral atom has 8 electrons. Two electrons fill the first shell, and 6 go into the second (valence) shell. Two more electrons would fill the valence shell.

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