I ONLY HAVE 17 MINS LEFTTT PLEASE HELLLP I WILL REWARD CROWN

Will mark brainliest how many electrons can be held in the energy level n = 4?

Which description best characterizes the motion of particles in a solid?

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.