An sn2 reaction is a type of choose. In which the nucleophile attacks the electrophile choose. A leaving group leaves. The rate of the reaction depends on the concentration of choose. .

Elias is almost correct. he just got it backwards.the correct answer is that it demonstrates elastic potential energy transforming into kinetic energy.

Mass of water is smething that you froma drug test or sum girl ya

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.