V

This type of mutation is known as a deletion.

Nope, what you're thinking of is actually called an inversion mutation (a type of structural aberration); a chromosomal mutation is simply any sort of mutation that affects an organism's genotype.

Chromosomal aberrations occur when any of a number of structural changes in chromosomes. These changes result from abnormal divisions within the chromosomes, and may occur as a loss of the chromosome or the duplication of the chromosome.

Aberration is a noun.