Question

Which isotope is represented by \( 12_6C \)?

• A. \( 12_6C \)
• B. \( 214_{82}Pb \)
• C. \( 3_1H, 2_1He \)
• D. \( 198_80Hg, 197_79Au \)

Hint:

In isotopic notation, the superscript is the mass number, and the subscript is the atomic number. The difference gives the number of neutrons.

Answer 1

The Correct Option is A

Step 1: Recognizing the isotopic notation.
The notation \( 12_6C \) refers to carbon-12, where: - 12 is the mass number (sum of protons and neutrons), - 6 is the atomic number (number of protons).
Step 2: Conclusion.
The isotope represented by \( 12_6C \) is carbon-12, making option (A) the correct answer.