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Pts a metal crystallizes in a body centered cubic

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4. (4 pts) A metal crystallizes in a body-centered cubic unit cell with an edge length of 2.00 × 10 2 pm. Assume the atoms in the cell touch along the cube diagonal. The percentage of empty volume in the unit cell will be: a) 48% b) 26.0% c) 32.0% d) 68.0% e) none of these
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2 5. (4 pts) Which substance can be described as cations bonded together by mobile electrons? 6. (6 pts) (i) What is the most abundant element found in the human body? (ii) Which of the following is the most abundant metal on earth? 7. (4 pts) Give the molecular formula of the following compounds: a) Lithium oxide _________________ b) Sodium peroxide ______________________ c) Potassium superoxide ____________________ d) Lithium hydride __________________________ 8. (6 pts) (i) Choose the element with the smallest atomic radius. (ii) Choose the element with the smallest ionization energy. a) Li b) Na c) K d) Rb e) Cs
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3 9. (4 pts) (i) Choose the element with the highest melting point. (ii) Choose the only element that forms a regular oxide in the presence of an excess of oxygen gas. a) Li b) Na c) K d) Rb e) Cs 10. (10 pts) A 10.0 mg sample of a recently isolated gene fragment is added to enough water to make a 30.0 mL solution. The solution was found to have an osmotic pressure of 0.340 torr at 25 o C. Find the molar mass of the gene fragment.
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