Chemical reaction phenomenon, and what occurs in four symmetrical pairs of long answers in this puzzle

Question:

Answer:

IONTRANSFER

Length:

Similar Crossword Questions:

Movie good guys responsible for the circled squares in eight long puzzle answers
Massachusetts school ... and a description of the two-word meeting that occurs at the intersections of pairs of starred answers
Business term found in eight long puzzle answers
Each of this puzzle's long Across answers sounds like one
Puzzle title people hidden in eight long answers
This weekend's fridge contents, probably, and what's missing from five long puzzle answers?
Phenomenon observed in receding galaxies ... and in the answers to this puzzle's asterisked clues?
Provide recon, and another hint to this puzzle's long answers
Magic words ... or a hint to the other long answers in this puzzle
Fixed as a target ... or a hint to four pairs of intersecting answers in this puzzle
Phrase whose abbreviation is the key to four long puzzle answers
Reservoir, and hint to puzzle theme found in seven long answers
What the puzzle's long answers all were
Any of four long pairs featured in this puzzle
They're hidden in seven long answers in this puzzle
What this puzzle's long answers each have three of
Game in which the puzzle's long answers are pieces
Brief version of this puzzle's title hidden in eight long puzzle answers
Sweet, or, read another way, a hint to five long puzzle answers
Feature of six other long answers in this puzzle
End of a nursery rhyme, or the fate of this puzzle's other three long answers
Feature of this puzzle's three long Down answers
Puzzle honoree found in eight long answers
What each of the four long answers in this puzzle is
Show since 12/17/1989 whose five main family members are hidden in this puzzle's other long across answers