• (s²-) anion. Be sure to include all resonance structures that satisfy the octet rule. Draw the Lewis structure for the polyatomic trisulfide Ċ E X ċ []

Draw the Lewis symbols for the atoms Al and O. Use the Lewis model to determine the formula for the compound that forms from these two atoms.

(H₂O+) Draw the Lewis structure for the (H₂ ion. ĊĊ с X []¯

2. The questions which follow, are based on equations used in the construction of the Born- Haber cycle for the ionic compound MgO (s) a) Write the missing equations representing the enthalpy changes given. ΔΗ/ J Heat of formation of MgO - 602 Heat of atomization of magnesium +148 First ionization energy of magnesium +738 Mg (g) Mg* (g) + e Second ionization of magnesium +1451 Heat of atomization of oxygen +249 First electron affinity of oxygen - 141 Second electron affinity of oxygen +791 O(g) + e Lattice energy of MgO b) Selenium is below oxygen in Group VI of the periodic table. Suggest with a reason whether you would expect MgSe to have a higher or lower lattice energy than MgO. 7 c) Sketch the Born-Haber cycle for MgO.

Draw the lowest energy Lewis structure of CN^-. What is the formal charge on the carbon Adam?

Write the Lewis symbols that represent the ions in ionic compound. K2O

Draw the Lewis structures for [ClF2] + and [ClF2] – . How many bonding pairs and lone pairs surround the Cl atom in each ion?

What would the resonance structures of H2SeO3 be which feature an expanded octet?

In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy (a measure of the attractive force holding those ions together). Based on ion sizes, arrange these compounds by their expected lattice energy. Note that many sources define lattice energies as negative values. Please arrange by magnitude and ignore the sign. |lattice energy| absolute value of the lattice energy Greatest |lattice energy| (strongest bonds) Least |lattice energy| (weakest bonds) Answer Bank CsF RbF NaF LiF KF

Explain why more C and N atoms are required to form a compound with Ba. It is important to note that all atoms obey the octet rule. Hint generate the Lewis diagram for Ba(CN) 2 to help you answer this question.