CH-135
Proton and nucleon numbers
Chemistry · Secondary 3 · Hard · Proton and nucleon numbers
An element X has proton number 9 and nucleon number 19. What is the number of neutrons and electrons in a fluoride ion, F⁻, formed from X?
- 10 neutrons and 9 electrons
- 9 neutrons and 10 electrons
- 10 neutrons and 10 electrons
- 9 neutrons and 9 electrons
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