An orbital is the region around the nucleus where an electron can be found. One cannot really predict the position of an electron but one can surely determine the probability of spotting an electron in a particular region
Atoms used to be thought to look like little solar systems. Now they are thought to be nesting shells of probability density functions known as orbitals. The S1 and P1 orbitals are the first two...
The orbital names s, p, d, and f stand for names given to groups of lines in the spectra of the alkali metals. These line groups are called sharp, principal, diffuse, and fundamental.