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12 Dec 2019

Which sequence does not correctly arrange the elements in order of increasing energy released (electron affinity) upon formation of its monatomic anion?

a.

Be < B < O < F
b.

Cs < K < Na < Li
c.

Ne < Li < O < Cl
d.

N < C < O < F
e.

Mg < Si < S < Ar

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Tod Thiel
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13 Dec 2019

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Q11

In a galvanic cell ____takes place at the anode and ____takes place at the cathode.

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Q12 Choose the atomic ions which are isoelectronic with Cl-.

(a)Sc3+,Ca2+,Br+,Cl-,P2-,S3-

(b)Sc3+,Mg2+,Na+,Cl-,S2-

(c)Sc3+,Ca2+,K+,S2-,P3-

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Q13

. Arrange the following atoms in order of increasing size (small to large): Cl, F, P, and S.

____<____<____<_____

Arrange the following in order of decreasing ionisation energy: Br, Ar, Ar+, and Cl. Put charges in parentheses.

_____>_____>______>_____

Q14

For each pair, choose the species with the greater EEA:

(a) P, O

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(c) Te, I

Q15

One of the elements has these ionisation energies and electron affinity (all in kJ·mol–1): Ei1 = 503, Ei2 = 965, Ei3 = 3600, EEA = 46. In what group (column) of the periodic table is this element found? Enter the number (no units).

Q16

Which is the least electronegative element?


F,Cl,Br,I

1) What are the possible orbitals for n=3?

  1. s, p, d
  2. s, p, d, f
  3. s
  4. s, p

 

2) What value of ℓ is represented by a d orbital?  

  1. 1
  2. 2  
  3. 0
  4. 3

 

3) How many orbitals are contained in the third principal level (n=3) of a given atom?

  1. 9
  2. 3
  3. 18
  4. 7
  5. 5

 

4) Which of the following statements is TRUE?

  1. The principal quantum number (n) describes the shape of an orbital.
  2. The angular momentum quantum number (ℓ) describes the size and energy associated with an orbital
  3. The magnetic quantum number (mℓ) describes the orientation of the orbital.
  4. An orbital is a path that an electron follows during its movement in an atom
  5. All of the above are true

 

5) Which of the following transitions represents the emission of a photon with the largest energy?

  1. n=2 to n=1
  2. n=3 to n=1
  3. n=6 to n=4
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6) Choose the transition (in a hydrogen atom) below that represents the absorption of the shortest wavelength photon.

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  2. n=2 to n=3
  3. n=4 to n=5
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7) Each of the following sets of quantum numbers is supposed to specify an orbital. Choose the one set of quantum numbers that does not contain an error.

  1. n=2, ℓ =2, mℓ= +1
  2. n=2, ℓ=2, mℓ= 0
  3. n=3, ℓ=2, mℓ = -3
  4. n=4, ℓ=3, mℓ= -2
  5. n=4, ℓ=2, mℓ= +4

 

8) The element that corresponds to the electron configuration 1s2 2s2 2p6 3s2 3p6 4s1 3d5 is:

  1. titanium
  2. vanadium
  3. chromium
  4. manganese
  5. iron

 

9) Give the ground-state electron configuration for I.

  1. [Kr] 5s2 4d10 5p6
  2. [Kr] 5s2 4d10 5p5
  3. [Kr] 4d10 5p6
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10) Place the following elements in order of increasing atomic radius

            P                      Ba                    Cl

  1. Ba < P < Cl
  2. P < Cl < Ba
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  4. Cl < Ba < P
  5. Ba < Cl < P

 

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