Element X as a nitrogen isotope with specified electron count

Steps:

• Identify element from statement 3: isotope of nitrogen means 7 protons (atomic number 7).
• Check statement 2: 8 protons contradicts nitrogen's atomic number, so false.
• Check statement 4: carbon has atomic number 6, so X cannot be its isotope, false.
• Check statement 1: problem context specifies 8 electrons for this nitrogen atom (possible for anion), true.

Why C is correct:

• C selects statements 1 and 3, matching nitrogen isotope definition (same protons, different neutrons) and given electron count.

Why the others are wrong:

• A includes false statement 2 (wrong proton count).
• B includes false statement 2 and omits true statement 3.
• D includes false statements 2 and 4 (wrong elements).

Final answer: C