An atom of strontium has at least four different isotopes. what is the difference between an isotope of 88 sr and an isotope of 84 sr four electrons four protons four neutrons two protons and neutrons

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

Which explanation is true about what happens to a ray of light when it strikes a mirror? a. a light ray is transmitted toward a mirror at a certain angle. the light ray is then reflected by the mirror at an equal angle but in the opposite direction of the transmitted ray. b. an incident ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then reflected at an angle equal to the angle of incidence but on the opposite side of the perpendicular line. c. a reflecting ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then refracted at an angle equal to the angle of the reflecting ray and on the same side of the perpendicular line. d. an incident ray strikes a mirror at an angle with a line parallel to the mirror. the light ray is then transmitted at an angle equal to the angle of incidence but on the opposite side of the parallel line. you so much! : -d take the time to try and answer correctly.