Meen 222- Quiz 1

Meen 222- Quiz 1 - 2 2p 6 (b) Se 2-1s 2 2s 2 2p 6 3s 2 3p 6...

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Niels (Henrik David) Bohr (October 7, 1885 – November 18, 1962) was a Danish physicist who made fundamental contributions to understanding atomic structure and quantum mechanics. Bohr is widely considered one of the greatest physicists of the twentieth century. Prizes: Nobel Prize (1922), Hughes Medal (1921), Matteucci Medal (1923), Copley Medal (1938). MEEN 222 – 503 Spring 2008 Quiz #1 Student: Print First and Last Name Date: _______________________
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1.1.The net potential energy between two adjacent atoms is sometimes represented by the expression: Derive the an expression for (a) equilibrium interatomic distance ( r 0 ) in terms of A and n and (b) bonding energy at r 0 (E 0 ) in terms of A and n. …………………. .(1) from (1) the force at equilibrium distance is: …(2) By replacing B form Eq. (2) in equation for En we can get: Solving Eq. (2) for r 0 1.2.Give the electron configurations for the following ions: (a) P 5+ 1s 2 2s
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Unformatted text preview: 2 2p 6 (b) Se 2-1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 (c) Ni 2+ 1s 2 2s 2 2p 6 3s 2 3p 6 3d 8 Atomic numbers: Phosphorus Z=15, Selenium Z=34, Nickel Z=28 1.3.The bonding energy curves for two different atomic bonds are given on the plot below. Circle the answers that describe correctly the relative properties of the materials. T m = melting temperature, CTE = coefficient of thermal expansion, and E = elastic modulus a) CTE (1) < CTE (2) and Tm(1) > Tm(2) b) E(1) < E(2) and Tm(2) > Tm(1) c) CTE (1) > CTE (2) and E(1) < E(2) d) CTE (1) > CTE (2) and Tm(1) > Tm(2) Hint: More then one answer can be correct! 1 point 1 point 1 point n N r B r A E + = 1 n 2 N N r nB r A dr dE F + = = ( ) n , A , r f B r nB r A dr dE F 1 n 2 r r N = = = = + = r r N bond E ) n 1 1 ( r A E E = = = = 1 n 1 nB A r = 2 points 2 points 1 poin point...
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This note was uploaded on 07/28/2010 for the course MEEN 222 taught by Professor Radovic during the Fall '08 term at Texas A&M.

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Meen 222- Quiz 1 - 2 2p 6 (b) Se 2-1s 2 2s 2 2p 6 3s 2 3p 6...

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