The atomic number is the same as the proton number so the answer would be D) 10
I think the correct answer among the choices listed above is option B. The acceleration of gravity is a constant equal to 9.8 meters per second squared. You can see that all things fall at this rate if there is no air resistance in a system or when in a vacuum.
Friction causes resistance against a moving object. It can cause an object to slow down, or stop when there’s enough friction…. I hope this helps