Luke Skywalker is battling the Evil Sith Lord. He throws a chair (using the force) with a mass of 2 kg moving at a rate of 50 m/s/s. What is the force at which the chair hit the Evil Sith Lord?

The answer is b. because when it leaves the bat, its bringing motion on where its going.

So the main goal for the elements is stability which is a complete/full valence shell and typically the magic number for a stable element is 8 valence electron but not always. so elements to the left of the periodic table tend to be way less stable then those on the right, so the elements on the left are much more reactive.