How many unhybridized p atomic orbitals are present when a central atom exhibits tetrahedral geometry?

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge

Which change will decrease the number of effective collisions during a chemical reaction? a. adding a catalyst b. increasing the surface area c. decreasing the temperature d. increasing the reactant concentrations e. increasing the volume of the reactants

What mass of ca(oh)2 is needed to make 1250ml of a .75m solution?