What determines which element an atom is? a)mass of the atomb)number of neutronsc)number of protonsd)isotopes and ions

What was bohr’s contribution to the planetary model

What is the area in square meters of 448 g ai foil that has a thickness of 23921 nm? the density is 2.70 g/cm

Calculate the molarity of each aqueous solution: a. 78.0 ml of 0.240 m naoh diluted to 0.250 l with water b. 38.5 ml of 1.2 m hno3 diluted to 0.130 l with water