Which group represents particles that contain the same number of total electrons as mg?

Magnesium (Mg) has 12 electrons. Therefore, any group of particles with a total of 12 electrons would represent the same number of total electrons as Mg. This could include a neutral atom of another element with 12 electrons, such as sodium (Na) in its ionized form (Na^+), or a combination of two neutral atoms, such as carbon (C) and nitrogen (N) together, which would also total 12 electrons.