A particle that contains 9 protons, 10 neutrons and 10 electrons is a
Answer Details
The given particle contains 9 protons, which means it is an atom of the element with atomic number 9, which is fluorine. However, the number of electrons is 10, which means it has one extra electron compared to the neutral atom of fluorine. Therefore, the particle has a negative charge and is called a negative ion.
So, the correct option is "negative ion."