<span> 2 hydrogen atoms attached to an oxygen atom.</span>
It would be a physical change. It’s still water just in a different physical form. If it was a chemical change, it would no longer be water. For example, when the ice melts back into water...it’s still water.
To make sure no cracks are in the crucible and also to remove any moisture present in the crucible by the process of heating.
Answer: A. Sun, Moon, Earth
Second orbital can hold 8 electrons