Chemistry

Question Analysis
This question involves applying concepts of isotope abundance, average atomic mass, and subatomic particle consistency for isotopes of the same element.
The main focus is on understanding that average atomic mass is a weighted average of isotope masses, biased toward the more abundant isotope.

Key Concept Explanation
Isotopes of the same element have identical atomic number (protons) and identical electron count (when neutral); only neutrons (and mass number) differ.
Average atomic mass = (mass of isotope 1 × % abundance) + (mass of isotope 2 × % abundance) → weighted toward the more abundant isotope.

Step-by-Step Solution
1. Evaluate each option:
A) False: 50 is the mass number of Q-50, not the atomic number (atomic number = protons, constant for Q).
B) False: Isotopes of Q have the same number of protons (only neutrons differ).
C) True: Q-50 is abundant → averag...