IB Atomic Theory Q

IB Atomic Theory Q - 1. Consider the composition of the...

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1. Consider the composition of the species W, X, Y and Z below. Which species is an anion? Species Number of protons Number of neutrons Number of electrons W 9 10 10 X 11 12 11 Y 12 12 12 Z 13 14 10 A. W B. X C. Y D. Z (1) 2. Energy levels for an electron in a hydrogen atom are A. evenly spaced. B. farther apart near the nucleus. C. closer together near the nucleus. D. arranged randomly. (1) 3. Which is related to the number of electrons in the outer main energy level of the elements from the alkali metals to the halogens? I. Group number II. Period number A. I only B. II only C. Both I and II D. Neither I nor II (1) 1
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4. How do bond length and bond strength change as the number of bonds between two atoms increases? Bond length Bond strength A. increases increases B. increases decreases C. decreases increases D. decreases decreases (1) 5. Which of the following is true for CO 2 ? C==O bond CO 2 molecule A. polar non-polar B. non-polar polar C. polar polar D. non-polar non-polar (1) 6. The molar masses of C 2 H 6 , CH 3 OH and CH 3 F are very similar. How do their boiling points compare? A. C 2 H 6 < CH 3 OH < CH 3 F B. CH 3 F < CH 3 OH < C 2 H 6 C. CH 3 OH < CH 3 F < C 2 H 6 D. C 2 H 6 < CH 3 F < CH 3 OH (1) 7. The element vanadium has two isotopes, V 50 23 and V 51 23 , and a relative atomic mass of 50.94. (a) Define the term isotope . ………………………………………………………………………………………. ………………………………………………………………………………………. (1) (b) State the number of protons, electrons and neutrons in V 50 23 . ………………………………………………………………………………………. ………………………………………………………………………………………. 2
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(2) 3
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(c) State and explain which is the more abundant isotope. ………………………………………………………………………………………. ………………………………………………………………………………………. (1) (d) State the name and the mass number of the isotope relative to which all atomic masses are measured. ………………………………………………………………………………………. (1) (Total 5 marks) 8. What is the electron configuration for an atom with Z = 22? A. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 4 B. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4p 2 C. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 2 4p 2 D. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 2 (1) 9. (a) The diagram below (not to scale) represents some of the electron energy levels in the hydrogen atom. ________________________________ n = ________________________________ n = 6 ________________________________ n = 5 ________________________________ n = 4 ________________________________ n = 3 ________________________________ n = 2 ________________________________ n = l 4
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(i)
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This note was uploaded on 08/10/2008 for the course CHEM 110 taught by Professor Fenster during the Spring '07 term at McGill.

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IB Atomic Theory Q - 1. Consider the composition of the...

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