Periodic trends & Bonding (Ch 12 &13) 1. Fill in the following table: Property Trend Notes Size (radius) Ionization energy Electron affinity Electronegativity Bond polarity

Periodic trends & Bonding (Ch 12 &13) 2. Put the following in order of: a. increasing atomic size Si Ca Ge b. increasing ionic radius Cl - Ca 2+ Ar c. increasing ionization energy C N O d. least to most exothermic electron affinity C Si In e. increasing electronegativity C F Cl f. increasing polarity C-N C-O C-C

Periodic trends & Bonding (Ch 12 &13) 3. The successive ionization energies for an unknown element are shown below. IE 1 = 580 kJ/mol IE 2 = 1815 kJ/mol IE 3 = 2740 kJ/mol IE 4 = 11,600 kJ/mol To which family in the periodic table does the unknown element most likely belong?

Periodic trends & Bonding (Ch 12 &13) 4. Draw Lewis Structures for the following. Show resonance where applicable. a. H 2 O b. NCl 3 c. HCN (carbon is central atom) d. N 2 e. CO 2 f. NO 3 –

Periodic trends & Bonding (Ch 12 &13) 5. Draw two Lewis structures for the following molecules, one that obeys the octet rule and one that minimizes formal charge: a. BeF 2 b. POCl 3 c. BF 3 d. SO 4 2-

Periodic trends & Bonding (Ch 12 &13) 6. Given the following bond lengths, estimate bond lengths for the following ions: N-O 147 pm N=O 115 pm a. NO - b. NO + c. NO 2 -

Periodic trends & Bonding (Ch 12 &13) 7. Use the table of bond energies to estimate ∆H for the following reactions: Bond Bond Energy (kJ/mol) Bond Bond Energy (kJ/mol) H-H 432 C-H 413 H-Cl 427 O-H 467 C-Cl 339 N-H 391 O-O 146 N-N 160 O=O 495 N=N 418 C=O 745 N≡N 941 Cl-Cl 239 a. 2H 2 + O 2 → 2 H 2 O b. 2NH 3 → N 2 + 3H 2 c. CH 4 + Cl 2 → CH 3 Cl + HCl