Using a periodic table, answer the following question: Which series of elements have the same number of valence electrons?
A. Sn, Pb, F, I
B. Ca, Sr, Cu, Ag
C. Na, Mg, Si, B
D. N, P, Sb, Bi

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Modern weaponry has increased the number of deaths in wars and violent conflicts.