Rule tested
1. Sub-verb agreement - pronoun . an atom is singular, 'it' should be used
2. Modifier - which
3. Punctuation - ;
4. Meaning
Under most conditions, an atom of one of the noble gases is inert 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.
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. - 1
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. -
CorrectC) because its outer orbital contains the maximum number of electrons, which makes these elements more stable and less able to react with other atoms and molecules. - 2
D) because their outer orbital contains the maximum number of electrons, making these elements more stable and less able to react with other atoms and molecules. - 1
E) because their outer orbital contains the maximum number of electrons, and the completion of their outer orbitals makes these elements more stable and less able to react with other atoms and molecules.- 1 & 4