CHM 2353 Lecture Notes - Lecture 6: Wurtzite, Sphalerite, Fluorite

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7 Nov 2017

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Bonding between metals and nonmetals is usually ionic. Cations have higher zeff (fewer shielding electrons) than neutral atoms, and have a smaller size. Anions have lower zeff (more shielding electrons) and have a larger size. Covalent compound: atoms are combined to form discrete molecular units (molecules) Metals: atoms are packed together in a lattice. Ionic compounds: cations and anions are packed together in a lattice. In an ionic lattice, some spheres are positively charged and others are negatively charged. The cations and anions in the ionic lattice have difference sizes. Nb: both lattices are neutral: in a metallic lattice, it"s because all atoms are neutral, in an ionic lattice, it"s because the charges from the cations and anions balance each other out. The type of ionic lattice formed will depend on the charge and the size of the ions involved.

Related Questions

True or False.

(a) Effective nuclear charge (Zeff) is the positive charge experienced by the electron from the nucleus and it increases from left to right across the period. Answer: __________

(b) Effective nuclear charge slightly decreases going down a group. Answer: __________

(d) Atomic radius tends to decrease from top to bottom of a group because of the increase in the principle quantum number. Answer: __________

(e) Anions are larger than their parent atoms because electrons are added to the valence shell reducing the electron-electron repulsions. Answer: __________

(f) Al3+ is larger than Na+ because Na+ has two extra electrons. Answer: __________

(g) The ionization energy of Na2+ is significantly higher than Na+ because it takes more energy to remove the inner-shell electron. Answer: __________

(h) Bromine, calcium and sodium are metallic elements because they are on the left side of the periodic table. Answer: __________

(i) Calcium, antimony, and silicon are metalloids that their properties fall between those of metals and those of nonmetals. Answer: __________

(j) Lattice energy is the energy required to completely separate one mole of solid ionic compound into its gaseous ions and it is always a negative number. Answer: __________

Answer to the following short questions:

1. What is the percentage of chlorine present in ?

2. What is the volume in of of oil if its density is ?

3. Find the error(s) and rewrite the text in the correct form.

“According to the Dalton model for the atomic structure, the atomic structure is composed of a nucleus in the center and electrons orbiting around it. The Nucleus has always the same number of protons and neutrons and they are located in the Nucleus. The nucleus carries almost the whole of the mass of the atom. The nucleus is positively charged and the electron is negatively charged. Anions are obtained when electrons are lost. Anions and Cations form salts via ionic bonding. Salts are always soluble in water. All Covalent compounds (molecules) are not soluble in water”.

4. What is the oxidation number of the Sulphur atom in ?

5. The following equation describes the burning of hexane in oxygen: How many moles of water would be produced if of hexane was burnt in excess oxygen?

graybeaver739

I have question number 2.61 please help me and explain to me. thanks

CHM 2353 Lecture Notes - Lecture 6: Wurtzite, Sphalerite, Fluorite

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