Changes

[[Nitrogen]], [[Oxygen]] and [[Fluorine]] can all gain [[electron]]s to become [[Negative Charge|negative]] [[ion]]s in certain [[reaction]]s.

The [[reactivity]] increases as you go across the [[Period (Chemistry)|period]]:

*The outer [[electron]]s are all roughly the same distance away from the [[Atomic Nucleus|nucleus]].

*The [[charge]] on the [[Atomic Nucleus|atomic nucleus]] increases as you move go across the [[period]] but the [[electron]] shielding caused by the two inner [[electron]]s remains the same. This causes the [[electron]]s to experience a greater [[force]] of [[attraction]] as you move along the [[period]], making it easier for an [[atom]]s to gain more [[electron]]s to become [[ion]]s.

|}