1. What is the electronic configuration of a neutral hydrogen atom?
A.
1s¹
B.
1s²
C.
2s¹
D.
2p¹
Correct Answer:
1s¹
Explanation:
A neutral hydrogen atom has one electron, which occupies the 1s orbital. Therefore, its electronic configuration is 1s¹.
2. How many electrons are present in a neutral hydrogen atom?
A.
Zero
B.
One
C.
Two
D.
Three
Correct Answer:
One
Explanation:
The atomic number of hydrogen is 1, so a neutral hydrogen atom contains one electron.
3. Which shell contains the only electron of a ground-state hydrogen atom?
A.
K shell
B.
L shell
C.
M shell
D.
N shell
Correct Answer:
K shell
Explanation:
The hydrogen electron in the ground state occupies the first energy level, which is called the K shell.
4. What is the shell-wise electronic configuration of hydrogen?
A.
1
B.
2, 1
C.
1, 1
D.
2
Correct Answer:
1
Explanation:
Hydrogen has only one electron, and it is present in the first shell. Thus, its shell-wise configuration is 1.
5. Which orbital is occupied by the electron in ground-state hydrogen?
A.
1s
B.
2s
C.
2p
D.
3s
Correct Answer:
1s
Explanation:
The single electron of ground-state hydrogen occupies the lowest-energy orbital, the 1s orbital.
6. What is the electronic configuration of the hydride ion H⁻?
A.
1s⁰
B.
1s¹
C.
1s²
D.
2s²
Correct Answer:
1s²
Explanation:
A hydride ion has two electrons because a hydrogen atom gains one electron. Both electrons occupy the 1s orbital, giving 1s².
7. How many valence electrons does a hydrogen atom have?
A.
Zero
B.
One
C.
Two
D.
Eight
Correct Answer:
One
Explanation:
Hydrogen has the electronic configuration 1s¹, so its first and outermost shell contains one valence electron.
8. Which statement about the ground-state electronic configuration of hydrogen is correct?
A.
It has two electrons in the 1s orbital
B.
It has one electron in the 1s orbital
C.
It has one electron in the 2s orbital
D.
It has one electron in the 2p orbital
Correct Answer:
It has one electron in the 1s orbital
Explanation:
Ground-state hydrogen contains one electron, and this electron occupies the lowest-energy 1s orbital.
9. Which species has the same electronic configuration as helium?
A.
H⁺
B.
H
C.
H⁻
D.
H²⁺
Correct Answer:
H⁻
Explanation:
The hydride ion H⁻ has two electrons with the configuration 1s², which is the same electronic configuration as helium.
10. What is the electronic configuration of a neutral hydrogen atom in its ground state?
A.
1s1
B.
1s2
C.
2s1
D.
2p1
Correct Answer:
1s1
Explanation:
A neutral hydrogen atom has one electron, which occupies the 1s orbital in the ground state.
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