31 protons 31 electrons and 39 nutrons
Most atoms have more neutrons than protons which accounts for basically half of the nucleuses mass.
Answer:
have stars that might appear to wobble
often have one star that is brighter than the other
Explanation:
A binary star system is a star system made up of mostly two stars that moves round their common fixed center.
The two orbiting stars are gravitationally bonded to one another and they move round each other.
Most binary stars might appear wobble. One of the stars often appears brighter than the other.
Answer:
Boron. The answer is boron.
