If the atoms in solid matter a tightly grouped?

Biologik

Why don't the electrons ever hit each other,and when they do what happens? Do the atoms sometimes have more electrons than protons because other electrons from other atoms come close to it and get caught in its orbitals?

JDługosz

Look up "atomic bonds".

Dr Lots-o'watts

In non-metals, they electrons don't wander very much (not to say "at all", in most academic theoretical models).

In metals, grossly speaking, they don't hit, they stay apart because of charge repulsion. Giving them higher energies may make them come closer and closer but this doesn't happen unless the metal is externally influenced somehow (heat for example).