Grade 10 · Science
Count protons, neutrons and electrons
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A sodium ion has 11 protons and a 1+ charge. How many electrons does it have?
- 10
- 8
- 6
- 11
See the answer & why
10
A 1+ ion has one fewer electron than proton: 11 − 1 = 10.
A little hint: Atomic number counts protons; mass number is protons plus neutrons.
Atomic number counts protons; mass number is protons plus neutrons.
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