posted by Yui
Which statement correctly describes an atom of the element helium?
A. An atom of helium has its valence electrons in it's first energy level.
B. An atom of helium most similarly behaves like an atom of hydrogen since it is in the same period.
C. An atom of helium has a full outer energy level and is therefore unusually reactive.
D. An atom of helium has eight electrons in its outer energy.
B is wildly wrong !!!
C is also Wildly wrong for the same reason. Hydrogen reacts. Helium reacts with essentially nothing because that first level is full of its two electrons
D is just crazy. Helium is our second element with two protons and two electrons.