Solving periodic puzzle
Chemistry
Level
2
The above is some portion of the periodic table of chemical elements. Which of following is the correct explanation about the elements A~D?
Element [A] has 8 valence electrons.
Element [C] has 15 electrons.
The chemical properties of elements [B] and [C] are similar.
Element [D] has the most electron shells.
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1 solution
The period of an element decides the number of shells. As D is in Period 3, which is larger than all the others, it has 3 shells and therefore Element [D] has the most electron shells.