The most common and most likely answer to this crossword clue is the 8 letter word NEUTRONS which also is the latest solution we found used in Boston Globe in 2010.
Components of an isotope number crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| NEUTRONS | 100 % | 8 | 
Words with a meaning similar to the clue: Components of an isotope number
These words may or may not be a possible solution to this crosswords clue.- tritium
 - abundance
 - astatine
 - ionium
 - radiothorium
 - actinouranium
 - cobalt 60
 - strontium 90
 - thorium-228
 - uranium 235
 - heavy hydrogen
 - protium
 
Crossword Answer definitions
NEUTRONS noun- A subatomic particle forming part of the nucleus of an atom and having no charge; it is a combination of an up quark and two down quarks.
 
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution