Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.



Question

secondary 4 | E Maths
One Answer Below

Anyone can contribute an answer, even non-tutors.

Answer This Question
R
R

secondary 4 chevron_right E Maths chevron_right Singapore

Hi can someone please explain to me why nitrogen has 2 lone pairs here?
I thought it only has five valence electrons?

Date Posted: 1 year ago
Views: 299
John Chua
John Chua
1 year ago
The extra electron comes from an external source, hence it contains a -1 charge. This is why there’s a general rule in chemistry that ions exists in pairs (ie. Cations and anions). NH2- in the anion, while the cation is the chemical species that has donated the extra electron to the nitrogen forming a -1 charge.

See 1 Answer

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Jefri ST
Jefri St's answer
39 answers (Tutor Details)
1st
Hi, R. I hope it helps.