A)because their outer orbital contains the maximum number of electrons; the completion of their outer orbital makes these elements more stable and less able to react with other atoms and molecules-The pronoun should be "its" to refer the singular noun "atom"- So eliminate.
B)because its outer orbital contains the maximum number of electrons; the completion of the outer orbital makes the atoms of the elements more stable and less able to react with other atoms and molecules-
...
B)because its outer orbital contains the maximum number of electrons; the completion of the outer orbital makes the atoms of the elements more stable and less able to react with other atoms and molecules-
...
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