Beryllium, magnesium, calcium, strontium, barium, and radium
Answer:
A.
Explanation:
When an electron gets excited it moves into a different orbital. Light is produced when the electron falls back to its original orbital.
the hormonal activity (relaxin and progesterone) is responsible for that.
Answer:
When a ball is lifted up and out, its kinetic energy remains zero, but its potential energy is greater, because gravity can make it fall. After the ball is released, its potential energy is converted into kinetic energy during its fall because of the work gravity does on it.