Hii pls help me to balance the equation and state the symbols thanksss​

Particles vibrate in a rigid structure and do not move relative to their neighbors.

When hydrochloric acid reacts with potassium hydroxide solution, the following reaction occurs. hcl (aq) + koh (aq) h2o (l) + kcl (aq) the reaction gives off heat energy, so it is an reaction.

Will mark brainliest how many electrons can be held in the energy level n = 4?