proton - relative charges +1 ,relative masses 1
neutron - relative charges 0 ,relative masses 1
electron - relative charges -1 ,relative masses 1/1840

An atomic orbital is a region of space round the nucleus in which the probility of finding a particular electrons is the greatest.
Four types if orbital-s,p,d and f

A sub-shell is a group of orbitals with the same energy level, but differ in their orientation in space. okay.this is the part i cannot understnad. Like what energy level and patterns.
And like need to fill the arrows in the boxes.i really very confused.
But i think i will try to understand, i just bought chemistry study guide.so i will read through the book first.