Answer:
the stem, but if its more specific xylem cells
This is true, this isn't a question, it's a fact.
Most atoms do not. For those atoms that do not have a full valence shell (which usually would contain eight electrons, except for hydrogen and helium, where it would contain two), something has to change. So nature's tendency toward a full valence shell will lead to one of two things: The gain or loss of electrons.
I believe it would be 1.660539040 × 10−24 gram.
Einsteinium
I hope that helps