Why is vanadium so rare? All other low atomic number elements

It got vanned.

>>9084885
Element abundance is mostly to do with atomic number and nuclear binding energy. More low atomic number elements because the universe started with only hydrogen. High binding energy because fusion will tend to go toward those targets. It also depends on chemical properties, so helium for instance has escaped the earth pretty easily.

Perhaps a better example is lithium: atomic number 3, but has about the same abundance as neodymium, because it has a very low nuclear binding energy.