A particle that contains 11 protons, 12 neutrons and 10 electrons is probably a
Answer Details
The particle described in the question has 11 protons, which makes it an atom of the element sodium (Na) since the atomic number of sodium is 11. The particle also has 12 neutrons, which means it has a mass number of 23 (11 protons + 12 neutrons = 23). However, the particle has 10 electrons, which is not the same as the number of protons. Therefore, the particle has a charge of +1 since it has one less electron than protons. This means that the particle is a metallic ion. So, the correct option is "metallic ion".