Answer:
B. The region outside a nucleus where the electron is moving
Explanation:
The more the electron moves, the higher energy level it has, the slower the electron moves the lowwer energy level it has.
2) Dissolution is associated with heat change.
I can't find the c orrect ratio in the selection. The formula for beryl is Be3Al2(SiO3)6 so it should be 3:2:6.