Because a good stepping stone would be a solid and if that solid were to melt or turn to gas you’d have no stepping stone.
The water gets cold because the ice cube is endothermic. Which means it takes in heat. It takes the warmth from the water and melts the ice cube which the ice cube releases coldness which cools down the water.
Heyo, I believe that the answer would be D. The valence electrons are given up by the K and gained by the F.
Each natural element has a characteristic light spectrum that helps identify it in samples of unknown substances. Spectroscopy is the practice of examining spectra and comparing them to those of known elements. Using spectroscopy methods, scientists can identify pure substances or compounds and the elements in them.
