(En)

[Chris Korban 1D]

for ehtylene Diammine, why is it that there is a full ethylene C2H4 but the ammines both have a missing H, even though ammine is usually NH3. The formula is NH2CH2Ch2NH2 in which the whole ethylene is present but both of the ammines are missing the last H. Why is that?

[Alexis DeHorta 2A]

"di" I believe is the Greek prefix for two. therefore, I believe that in ethylene Diammine it is written as NH2CH2Ch2NH2. So, two instead of three. Hope this helps.

[Joelle Tran 1K]

https://chemistry.stackexchange.com/que ... menclature

I definitely think the info in this link will help answer your question!

[Joseph Liao 3C]

So I did some research online and I found this:
https://wikidiff.com/ammine/amine
"As nouns the difference between ammine and amine is that ammine is (inorganic chemistry) any of a class of coordination compounds in which ammonia acts as a ligand while amine is (inorganic chemistry) a functional group formally derived from ammonia by replacing one, two or three hydrogen atoms with hydrocarbon or other radicals."
That explains why the amine groups in diethlyene amine are missing.