The smallest unit of an element that maintains the properties of that element

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

Sound is a disturbance that travels through a medium as a

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?