Answer:
a
Explanation:
what the heck is a medium
True. No matter can be created nor destroyed in pretty much every aspect of life, especially chemical reactions.
The Bohr's proposal for the angular momentum of an electron in Bohr's model of the hydrogen atom is:
L=(n*h)/(2π), where n is the number of the energy level and h is the Planck's constant. This equation shows us the quantization of angular momentum of the electron. So the correct answer is the second one: Planck's constant.
Fluorine it has a atomic radius of 42