Question

which element has similar chemical reactivity to the element in the diagram

Explanation:

Chemical reactivity is often determined by the number of valence electrons. The electron configuration diagram shows that the element has 3 valence electrons (2 in the 2s orbital and 1 in the 2p orbital). Boron also has 3 valence electrons (2 in the 2s orbital and 1 in the 2p orbital). Elements with the same number of valence electrons tend to have similar chemical reactivity.

Answer:

Boron