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- 1. Multiple Choice
Which one of the following is the electronic configuration of the bromine atom?
1s22s22p63s23p63d104s14p6
1s22s22p63s23p63d104s24p7
1s22s22p63s23p63d104s24p5
1s22s22p63s23p63d104s24p6
- 2. Multiple Choice
To which one of the following energy levels (denoted by n) does the electron in a hydrogen atom return when the emission spectrum is in the ultraviolet region;
n= 1
n = 2
n = 3
n = 4
- 3. Multiple Choice
Which one of the following does not represent the electronic configuration of an atom in its ground state?
1s2 2s2 2p3
1s2 2s2 2p4
1s2 2s2 2p6 3s1
1s2 2s2 2p6 3d1
- 4. Multiple Choice
Which one of the following is the maximum number of atomic orbitals having a principal quantum number of two?
2
4
8
9
- 5. Multiple Choice
Which one of the following contains no unpaired electrons in the ground state?
Be
F
Si
N
- 6. Multiple Choice
Which one of the following is the electronic structure of a metal with a maximum oxidation state of +3?
1s2 2s2 2p6 3s1
1s2 2s2 2p6 3s2 3p4
1s2 2s2 2p6 3s2 3p1
1s2 2s2 2p6 3s2 3p6 3d10 4s2
- 7. Multiple Choice
Which of the following statements regarding electronic orbitals is/are correct?
Each p-orbital can hold a maximum of six electrons.
The 3p-orbitals have a higher energy level than the 3s-orbital.
The three 3p-orbitals have slightly different energy levels.
The 1s-orbital has the same size and shape as the 2s-orbital.
- 8. Multiple Choice
The number of electrons in the 3d orbital of the atom of atomic number 27 is
5
6
7
10
- 9. Multiple Choice
The vanadium atom (atomic number 23) in its ground state has the electronic configuration:
1s2 2s2 2p6 3s2 3p6 3d3 4s2
1s2 2s2 2p6 3s2 3p6 3d2 4s3
1s2 2s2 2p6 3s2 3p6 3d1 4s2 4p2
1s2 2s2 2p6 3s2 3p6 3d2 4s2 4p1
- 10. Multiple Choice
Which one of the following compounds contains two ions with different electronic configurations?
CaCl2
MgF2
MgO
NaCl
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