An atom has an atomic number of 12 and a mass number of 0.25. how many neutrons does the atom have?

Which statement best explains why the overall charge on an atom is zero?

The largest observatory complex in the world is on mauna kea, the tallest mountain on earth. what are some factors astronomers consider when selecting an observatory site? don’t forget practical ones. should astronomers, for example, consider building an observatory on denali (mount mckinley) or mount everest?

What would be the net charge of 1 gram gold piece after removal of 1% of its electrons