General Science - Physics (Basics)
If an atom has 15 electrons and 16 neutrons, what is its atomic number and mass number respectively?
If an atom has 15 electrons and 16 neutrons, what is its atomic number and mass number respectively?
medium Q15 of 15
Step-by-Step Solution
Step 1: Identify atomic number
Atomic number equals the number of protons, which equals electrons in a neutral atom. Here, electrons = 15, so atomic number = 15.Step 2: Calculate mass number
Mass number = protons + neutrons = 15 + 16 = 31.Final Answer:
15 and 31 → Option AQuick Check:
Atomic number = Electrons = 15; Mass number = Protons + Neutrons = 31 ✅
Quick Trick: Atomic number = electrons in neutral atom; mass number = protons + neutrons.
Common Mistakes:
MISTAKES- Mixing up atomic number with mass number or neutron count.
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