Since we already have the balanced equation, we know that the ratio between
is
respectively.
So then we can set up a proportion to find the number of moles produced when 2.90 moles of Na react completely:

Then we cross multiply and solve for x:


Therefore, we know that when 2.90 moles of Na react completely, there are 1.45 moles of
that are produced.
Your answer to your question is: 1s² 2s² 2p⁶
Kinetic energy remains conserved in an elastic collision.
The basic building block of matter is the atom.