When a force of 15 newton’s is applied to a stationary chair what can u say about the frictional force

If the force applied(Fa) is pushing down to chair friction goes up. if Fa pushing up, friction goes down. if Fa pushing sideways and the chair stays stationary, friction stay the same. if Fa push sideway and chair moves, friction goes down

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.