which planet in the solar system has not been examined by spacecraft instruments that have either flown by or orbited them?

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

Which is special about a dc circuit ? a. it has both series and parallel components b. it has only series or only parallel components c. charge moves in a single direction d. charge moves back and forth quickly

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?