Select all that apply. A chemist is likely to do which of the following?

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.

The discovery of the electron as a subatomic particle was a result of

How many electrons does each element require in its valence shell to become stable?