# Modern Atom Theory ```Modern Atom Theory

(1)
(2)
( ) Oxygen molecule is diamagnetic.
( ) Paramagnetic substances have unpaired electrons and are drawn toward
the space between a magnet’s poles.
( ) The longer the wavelength of light, the lower the energy of its photons.
( ) There are two 4d electrons found in Zr (Z = 40).
( ) A 3p orbital has more lobes than a 2p orbital.
( ) The electron path is indicated by the surface of the orbital.
( ) An atomic orbital can hold a maximum of two electrons, and those two
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electrons must have opposite spins.
( ) The actinides series of elements corresponds to the filling of the 4f
orbitals.
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(9) ( ) The 2s orbital is the same size as the 3s orbital.
(10) ( ) The electron is somewhere inside the orbital surface 90% of the time.
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(1)
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(2)
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Which statement is false? (A) The number of lobes on a p orbital
increases as n increases. (B) The 3s orbital is larger than the 2s orbital.
(C) The number of sublevels present in a given principle energy level
equals n. (D) The electron is somewhere inside the orbital surface 90%
of the time.
What is the maximum number of electrons in an atom that can have
these quantum numbers: n = 5, s = -&frac12;? (A) 10 (B) 15 (C) 25 (D) 50
What is the maximum number of electrons in an atom that can have
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these quantum numbers: n = 2, ℓ= 2, m = -1, s = -&frac12;? (A) 0 (B) 1 (C) 2
(D) 3
What is the maximum number of electrons in an atom that can have
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these quantum numbers: n = 3, ℓ= 2? (A) 2 (B) 6 (C) 10 (D) 14
What is the maximum number of electrons in an atom that can have
these quantum numbers: n = 5? (A) 10 (B) 15 (C) 25 (D) 50
What is the maximum number of electrons in an atom that can have
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these quantum numbers: n = 2, ℓ= 1? (A) 0 (B) 2 (C) 6 (D) 10
Which element has the smallest atomic size? (A) Cl (B) F (C) N (D) O
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(14) ( )
Which element would be expected to have the highest ionization
energy? (A) Mg (B) Na (C) S (D) Si
How many 4d electrons are found in Zr (Z = 40)? (A) 2 (B) 4 (C) 6 (D)
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The correct configuration for Cu (Z = 29) is (A) [Ar]3d6 (B) [Ar]4s13d5
(C) [Ar]4s23d4 (D) none of these.
The electron configuration of chromium is (A) [Ar]4s13d5 (B)
[Ar]4s23d4 (C) [Ar]4s23d14p3 (D) [Ar]4s33d3.
How many valence electrons does Krypton (Z = 36) possess? (A) 2 (B)
4 (C) 6 (D) 8
The lantnanide series of elements corresponds to the filling of the (A) 3f
(B) 4f (C) 5f (D) 6f orbitals.
Which of the following orbital designation is not correct? (A) 2d (B) 2p
(C) 4d (D) 4f
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(1)
Write the full electron configuration (1s22s2, etc) for each of the following
elements?
(a) chlorine, Z = 17
(1)
(b) copper, Z = 29
(a) 1s22s22p63s23p5 or [Ne]3s23p5
(b) 1s22s22p63s23p64s13d10 or [Ar] 4s13d10
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