What is an electron shell? How many electrons fit in the first, second, fourth And subsequent shell?

Its due tonight so take your time I guess.

An electron shell is the outside part of an atom around the atomic nucleus. It is a group of atomic orbitals with the same value of the principal quantum number n. Electron shells have one or more electron subshells, or sublevels.

Explanation:

The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6), The 4th shell can hold up to 32 electrons.

I don't know the last one though

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge