What is terminal speed? when a skydiver has reached terminal speed, what is the are resistance equal to? what is the skydiver’s acceleration?

Terminal speed is the speed at which the force from the weight of the object equals the force of air resistance, so the acceleration is zero. When a skydiver reaches terminal speed, the air resistance is equal to the force of weight of the skydiver. At terminal speed, the sky diver's acceleration is zero.

The charge of an ion with 55 protons and 52 electrons is +3. the reason is because protons are positive, and there are three more than the amount of negative electrons.