CH-186
Proton and nucleon numbers
Chemistry · Secondary 3 · Hard · Proton and nucleon numbers
An element X has atomic number 12 and mass number 25.
How many protons, neutrons and electrons are there in a neutral atom of X?
How many protons, neutrons and electrons are there in a neutral atom of X?
- 12 protons, 12 neutrons, 13 electrons
- 12 protons, 13 neutrons, 12 electrons
- 13 protons, 12 neutrons, 12 electrons
- 25 protons, 12 neutrons, 13 electrons
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