1. Which orbital contains the electron in the ground-state hydrogen atom?
A.
1s
B.
2s
C.
2p
D.
3s
Correct Answer:
1s
Explanation:
The single electron of hydrogen occupies the lowest-energy orbital, which is the 1s orbital.
2. What is the shell-wise electronic distribution of hydrogen?
A.
1
B.
2
C.
2, 1
D.
1, 1
Correct Answer:
1
Explanation:
Hydrogen has only one electron, and it is present in the first shell.
3. Which statement correctly describes the electronic configuration of hydrogen?
A.
It has one electron in the 1s orbital.
B.
It has two electrons in the 1s orbital.
C.
It has one electron in the 2s orbital.
D.
It has two electrons in the 2p orbital.
Correct Answer:
It has one electron in the 1s orbital.
Explanation:
The ground-state configuration of hydrogen is 1s¹, meaning one electron is present in the 1s orbital.
4. What is the electronic configuration of the hydride ion H⁻?
A.
1s⁰
B.
1s¹
C.
1s²
D.
2s²
Correct Answer:
1s²
Explanation:
The hydride ion gains one electron, giving it two electrons in the 1s orbital; its configuration is 1s².
5. Which species has the same number of electrons as a neutral hydrogen atom?
A.
H⁺
B.
H
C.
H⁻
D.
He
Correct Answer:
H
Explanation:
A neutral hydrogen atom is represented by H and contains one electron. H⁺ has no electrons, while H⁻ and He have two electrons.
6. How many electrons can the 1s orbital of hydrogen accommodate at most?
A.
1
B.
2
C.
3
D.
4
Correct Answer:
2
Explanation:
An s orbital can hold a maximum of two electrons. Therefore, the 1s orbital can accommodate up to two electrons.
7. The electronic configuration 1s¹ represents which species in its ground state?
A.
A neutral hydrogen atom
B.
A hydrogen ion, H⁺
C.
A hydride ion, H⁻
D.
A helium atom
Correct Answer:
A neutral hydrogen atom
Explanation:
The configuration 1s¹ contains one electron, which is the electronic configuration of a neutral hydrogen atom in the ground state.
8. What is the electronic configuration of a hydrogen atom in its ground state?
A.
1s¹
B.
1s²
C.
2s¹
D.
2p¹
Correct Answer:
1s¹
Explanation:
A hydrogen atom has one electron, which occupies the 1s orbital in the ground state. Therefore, its electronic configuration is 1s¹.
9. How many electrons are present in the hydrogen atom's first shell?
A.
0
B.
1
C.
2
D.
3
Correct Answer:
1
Explanation:
A neutral hydrogen atom has one electron, and this electron is present in its first shell.
10. Which orbital contains the electron in a ground-state hydrogen atom?
A.
1s
B.
2s
C.
2p
D.
3s
Correct Answer:
1s
Explanation:
The single electron of hydrogen occupies the lowest-energy orbital, the 1s orbital, in the ground state.
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