1.1 Atomic Structure (5) Electronic Structure

Which one of the following ions with noble gas electronic configurations is never met in ordinary chemical compounds?
1. Be2+
2. Al3+
3. Ti4+
4. P5+
5. S2-
The number of electrons in the 3d orbital of the atom of atomic number 23 is
1. 2
2. 3
3. 4
4. 5
5. 6
Which one of the following is the electronic configuration of the bromide ion?
1. 1s22s22p63s23p63d104s14p6
2. 1s22s22p63s23p63d104s14p7
3. 1s22s22p63s23p63d104s24p5
4. 1s22s22p63s23p63d104s24p6
Which one of the following is the electronic configuration for the iron atom in the ground state?
1. 1s22s22p63s23p63d64s2
2. 1s22s22p63s23p63d8
3. 1s22s22p63s23p63d5
4. 1s22s22p63s23p63d6
How many electrons are there in a calcium ion, Ca2+?
1. 18
2. 20
3. 22
4. 40
Which one of the following is the maximum number of atomic orbitals having a principal quantum number of two?
1. 2
2. 4
3. 8
4. 9
Which one of the following is the electronic configuration of the bromine atom?
1. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁷
2. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹ 4p⁶
3. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶
4. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁵
Which one of the following is the electronic structure of a metal with a maximum oxidation state of +3?
1. 1s² 2s² 2p⁶ 3s² 3p⁴
2. 1s² 2s² 2p⁶ 3s² 3p¹
3. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²
4. 1s² 2s² 2p⁶ 3s¹
Which one of the following does not have the electronic structure
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶?
1. Kr
2. Sr²⁺
3. Se^2-
4. S^2-
Which one of the following statements regarding electronic orbitals is correct?
1. Each p-orbital can hold a maximum of six electrons.
2. The three 3p-orbitals have slightly different energy levels.
3. The 1s-orbital has the same size and shape as the 2s-orbital.
4. The 3p-orbitals have a higher energy level than the 3s-orbital.
Which one of the following sub-shells does not exist?
1. 2p
2. 3p
3. 2d
4. 4d
Which one of the following contains no unpaired electrons in the ground state?
1. Si
2. Be
3. N
4. F
Which one of the following is the electronic configuration of the Ni²⁺ ion?
1. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s²
2. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷ 4s¹
3. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸
4. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ 4s²
Which one of the following does not represent the electronic configuration of an atom in its ground state?
1. 1s² 2s² 2p³
2. 1s² 2s²2p⁶ 3d¹
3. 1s² 2s² 2p⁶3s¹
4. 1s²2s² 2p⁴
Which one of the following compounds contains two ions with different electronic configurations?
1. MgO
2. NaCl
3. MgF₂
4. CaCl₂
The vanadium atom (atomic number 23) in its ground state has the electronic configuration:
1. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d³ 4s²
2. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s³
3. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹ 4s² 4p²
4. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s² 4p¹
The number of electrons in the 3d orbital of the atom of atomic number 23 is
1. 3
2. 5
3. 2
4. 4
The atoms of elements X and Y have the following electronic structures:
X 1s² 2s² 2p⁶ 3s²
Y 1s² 2s² 2p⁶ 3s² 3p⁵
The compound formed between X and Y will have the formula
1. XY
2. X₂Y
3. XY₂
4. X₂Y₅

1.1 Atomic Structure (5) Electronic Structure

Multiple-choice questions