5 Valence electrons .......... Hope it helps, Have a nice day:)
Concave is not a type of mechanical wave because it doesn’t need a medium for propagation.
1. No
2.No
I hope this helps:)
The organelles have specialized functions, (D)
<span>The first method to determine the chemical composition of a substance in space was using light. By determining red shift in the observed spectrum of light they could determine the elements they were observing. Different elements change the way light behaves and from this scientists can determine the makeup of things such as stars and nebulas.</span>
