How many valence electrons are in an atom of Zinc (III) Atomic number 30
Atomic mass 65.38
a 12
b 35
c 3
d 30

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

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