General Science - Physics (Basics)
An atom has 20 protons, 20 electrons, and 22 neutrons. What is its mass number?
An atom has 20 protons, 20 electrons, and 22 neutrons. What is its mass number?
easy Q3 of 15
Step-by-Step Solution
Step 1: Understand mass number
Mass number is the sum of protons and neutrons in the nucleus.Step 2: Calculate mass number
Mass number = 20 (protons) + 22 (neutrons) = 42.Final Answer:
42 → Option AQuick Check:
Mass number = Protons + Neutrons = 42 ✅
Quick Trick: Mass number = protons + neutrons.
Common Mistakes:
- Confusing mass number with atomic number or neutron count.
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