Element A will bond with element D.
We need to look at the Lewis structures of each of the elements closely. Recall that the dots show us the number of valence or outermost electrons in each atom.
Element A has only one valence electron and element D has seven valence electrons.
An ionic bond is possible between A and D where A looses an electron to D. When this happens, the both species attain a stable octet.
This is what we call the ionic or electrovalent bond. So, A and D will form an ionic bond with each other.
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