Virginia’s blue ridge mountains were once among the tallest in the world, similar in altitude to the himalayas of today. this would still be the case if not for the process of a) erosion. b) folding. c) volcanism. d) metamorphism.

A) Erosion is the answer, i checked on USATP

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

increased stability in the completion of fluorine's outer shell.