The elements Beryllium (Be), Magnesium (Mg), Calcium (Ca) and Strontium (Sr) are all what?

What is the standard unit of measure for acceleration?

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Many free radicals combine to form molecules that do not contain any unpaired electrons. the driving force for the radical–radical combination reaction is the formation of a new electron‑pair bond. consider the chemical equation. n(g)+no(g)⟶nno(g) n(g)+no(g)⟶nno(g) write lewis formulas for the reactant and product species in the chemical equation. include nonbonding electrons. n(g)n(g) select draw rings more erase select draw rings more erase select draw rings more erase n no(g)