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chemistry

1. the periodic table is based on an element's
a. molecular size.
b. molecular mass.
c. atomic mass.
d. atomic number.

2. one atom of silicon can properly be combined in a compound with
a. two atoms of oxygen.
b. one atom of chlorine.
c. three atoms of hydrogen.
d. four atoms of calcium.

Classify each statement about effective nuclear charge, zeff, as true or false.

What volume of a 2.00 m stock solution of naoh is needed to prepare 150. ml of 0.40 m solution?

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.