Answer:
The correct answer is A.
Explanation:
Helium's Atomic Model has 2 Protons and 2 Neutrons, and on the outside it has 2 electrons circling around it.
I believe when the wave encounters a large gapless barrier, the barrier will absorb some of the wave's energy.
A wave is a periodic disturbance that propagates itself through a medium or space. When a wave encounters a barrier that is the boundary of the medium in which the wave is travelling, the wave is reflected, and the barrier may absorb some energy of the wave.
4 S^3 = Ksp
<span>S ={ 1/4 Ksp}^1/3 </span>
<span>= [ 6.4/4 X 10^-9]^1/3 </span>
<span>= (1.6^1/3)*10^-3 </span>
<span>= 1.1696 x 10^-3 ANSWER</span>
Answer:
The atoms of different elements have different numbers of protons and electrons.