CHEM 121 2026 ATOMIC STRUCTURE AND
BONDING MASTER REVIEW
◉CN(-). Answer: Cyanide
◉SO4(-2). Answer: Sulfate
◉Molecular mass vs Formula mass. Answer: Molecular Mass: sum of
atomic masses of atoms in molecular compound (NON-METAL)
Formula: sum of atomic masses of all atoms in ionic compound
(METAL)
◉Calculate formula mass. Answer: Sum of: (Mass of element 1 x # of
element) + (mass of element 2 x # of element)
◉What "mole" represents:. Answer: 1 mole of element = 6.022 x
10^23 atoms
1 mole of compound = 6.022 x 10^23 molecules
BONDING MASTER REVIEW
◉CN(-). Answer: Cyanide
◉SO4(-2). Answer: Sulfate
◉Molecular mass vs Formula mass. Answer: Molecular Mass: sum of
atomic masses of atoms in molecular compound (NON-METAL)
Formula: sum of atomic masses of all atoms in ionic compound
(METAL)
◉Calculate formula mass. Answer: Sum of: (Mass of element 1 x # of
element) + (mass of element 2 x # of element)
◉What "mole" represents:. Answer: 1 mole of element = 6.022 x
10^23 atoms
1 mole of compound = 6.022 x 10^23 molecules
