Answer:
The correct option is 6
Step-by-step explanation:
The first shell of an atom can contain a maximum of two electrons and must be completely filled (with the two electrons) before the next electron shell is considered for filling. The second electron shell can contain a maximum of eight electrons.
If an element has 8 electrons, 2 of this electrons will occupy/completely fill the first electron shell, while the second shell will only contain the remaining 6 electrons.
NOTE: A neutral atom of an element with 8 electrons is oxygen.