answerchemactivity1chapter5

answerchemactivity1chapter5 - Na+ = 10,11,12 Cl = 17,17,18...

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Answers to ChemActivity 1 – The Nuclear Atom- Chapter 5 1. 6 2. 6,7,7 3. 6,6,7 4. (a) neutral same e and p, ion different e and p (b) assign +1 to each proton and -1 to each electron and take the difference. If more -1 it is a negative ion, if more +1 it is a positive ion. 5. (a) same number of protons (b) number of protons (c) one proton 6. Z = the number of protons 7. The same number of protons 8. The neutrons differ in number which means the mass number is different. 9. Mass number = protons + neutrons 10. Within the nucleus. More particles are in the nucleus. Exercises 1. 31 P A = 31 electrons = 15 18 O Atomic number = 8 A = 18 electrons = 8 39 K + Atomic number = 19 A = 39 electrons = 18 58 Ni 2+ Atomic number = 28 electrons = 26 2. H = 1.679X 10 -24 C = 1.9927 X 10 -23 3. 8.7 /x 10 -17 4. 11.996 g 5. 7.305 X 10 -23 6. (a) protons + neutrons (b) protons 7. False. Depending on the isotope it might have differing neutrons.
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8. Mg = 12,12,12 (e,p,n)
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Unformatted text preview: Na+ = 10,11,12 Cl = 17,17,18 Cl-= 18,17,18 Fe = 23,26,30 N = 7,7,8 O= 10,8,8 Al = 10,13,14 9. Co 2+ 27 59 25 N 7 14 7 Li 3 7 3 Li 3 6 3 Zn 2+ 30 58 28 F-9 19 10 10. The isotopes of an atom have the same number of protons and electrons, but they differ in number of neutrons. 11. Omit Problems 1. 14.0068 ( Take the mass of C12 then add the difference between C12 and C13. The difference between C12 and C13 is the mass of a neutron. 2. electron = 0.0005 amu ( subtract the mass of drawing one from drawing three) proton= 1.0073 ( subtract the mass of the electron from drawing one) neutron= 1.0062 ( subtract the mass of an electron and proton from drawing two) 3. C12 = 6 p + 6n + 6 e (6 X 1.0073) + (6 X 1.0087) + (6 X 5.486 X 10-4 ) = 12.099 amu According to the table at on the front page, C12 has a mass of exactly 12 amus....
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This note was uploaded on 01/03/2011 for the course CHEM 3302 taught by Professor Dickpowell during the Spring '10 term at UT Arlington.

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answerchemactivity1chapter5 - Na+ = 10,11,12 Cl = 17,17,18...

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