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the electron dot diagram shows the arrangement of dots without identifying the element.
which element’s symbol could replace the question mark in the diagram?
boron (b)
neon (ne)
rubidium (rb)
arsenic (as)

The answer would be Arsenic (As).

An electron-dot diagram is a graphical representation of the valence electrons of a certain element. The chemical symbol of an element placed in the middle and the valence electrons are represented by dots. The number of dots is equal to the number of valence electrons. 

So in your illustration, you can see that there are 5 dots all in all. This indicates that this mystery element has 5 valence electrons. Elements in Group 5A or the Nitrogen Group.

Among the choices, only Arsenic is under Group 5A.   

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom