General Science - Physics (Basics)
An element has two isotopes with mass numbers 35 and 37. If the atomic number is 17, what is the number of neutrons in each isotope?
An element has two isotopes with mass numbers 35 and 37. If the atomic number is 17, what is the number of neutrons in each isotope?
hard Q10 of 15
Step-by-Step Solution
Step 1: Understand isotope neutron calculation
Number of neutrons = Mass number − Atomic number.Step 2: Calculate neutrons for each isotope
For mass number 35: neutrons = 35 − 17 = 18. For mass number 37: neutrons = 37 − 17 = 20.Step 3: Verify options
Only option with 18 and 20 neutrons matches calculations.Final Answer:
18 and 20 → Option BQuick Check:
Neutrons = Mass number − Atomic number ✅
Quick Trick: Neutrons = Mass number − Atomic number.
Common Mistakes:
MISTAKES- Confusing mass number with atomic number or total nucleons.
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