Order The Atomic Structure Discussion Assignment

Order The Atomic Structure Discussion Assignment
39. An isotope of calcium undergoes electron capture and becomes
an isotope of which element?
(A) Calcium
(B) Scandium
(C) Potassium
(D) Argon
Order The Atomic Structure Discussion Assignment
40. The actual mass of an isotope is less than the sum of the masses
of the constituents by an amount known as the
(A) atomic weight
(B) atomic mass
(C) mass defect
(D) molar mass
41. Which element might have the following excited-state electron
configuration: 1s²2s²2p53s²3p¹?
(A) Al
(B) Mg
(C) Na
(D) Ar
42. Which is the only noble gas that does NOT have an ns²np6 outer shell
electron configuration?
(A) He
(B) Ne
(C) Ar
(D) Rn
10 ❯ McGraw-Hill’s 500 MCAT General Chemistry Questions
43. If an isotope of gold undergoes alpha decay, an isotope of which element
will result?
(A) Hg
(B) Pt
(C) Ir
(D) Tl
44. Which element has the following electron configuration: [Kr]5s²4d7?
(A) Ir
(B) Co
(C) Rh
(D) Tc
45. Copper-57 undergoes positron decay with a half-life of 200 ms.
Sodium-30 undergoes beta decay with a half-life of 50 ms. How does
the rate constant for the decay of sodium-30 compare with the rate
constant for the decay of copper-57?
(A) Smaller by a factor other than 4
(B) Smaller by a factor of 4
(C) Larger by a factor other than 4
(D) Larger by a factor of 4
Order The Atomic Structure Discussion Assignment
46. What radioactive decay mode is involved in the conversion of 86Br
to 86Kr?
(A) β decay
(B) β− decay
(C) α decay
(D) Electron capture
47. The isotope ¹00Pd undergoes electron capture. Which isotope does this
process produce?
(A) ¹00Ag
(B) ¹00Rh
(C) 96Ru
(D) 99Pd
Atomic Structure ❮ 11
48. The radioisotope iodine-131 is useful in studying the function of the
thyroid gland. The isotope has a half-life of 8.0 days. What percentage
of the iodine-131 remains in a sample after 40 days?
(A) 12.5%
(B) 6.25%
(C) 3.13%
(D) 50.0%

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