How did mendeleev's work in the discovery of new elements ?

98 ! and brainliest plz ! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

Ted and emily played a mixed doubles tennis match against jack and brenda. in the second match. ted and brenda played against jack and emily. which type of chemical reaction does the situation demonstrate?

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons