We can see here that these two elements will have similar chemical properties due to: D. They have the same number of valence electrons.
Valence electrons are the electrons in the outermost energy level of an atom. They play a crucial role in determining an element's chemical properties, such as its ability to bond with other atoms. Elements with the same number of valence electrons tend to exhibit similar chemical behavior.
In a Bohr diagram, the nucleus of the atom is represented by a small circle in the center, and the electrons are shown as smaller circles in specific energy levels or shells surrounding the nucleus.