1. What is the atomic number of hydrogen?
A.
1
B.
2
C.
3
D.
4
Correct Answer:
1
Explanation:
Hydrogen has one proton in its nucleus, so its atomic number is 1.
2. How many protons are present in the nucleus of a hydrogen atom?
A.
0
B.
1
C.
2
D.
3
Correct Answer:
1
Explanation:
The atomic number of hydrogen is 1, which means every hydrogen atom contains one proton.
3. How many electrons are present in a neutral hydrogen atom?
A.
0
B.
1
C.
2
D.
3
Correct Answer:
1
Explanation:
A neutral atom has equal numbers of protons and electrons. Hydrogen has one proton, so it has one electron.
4. What is the electronic configuration of hydrogen?
A.
1s¹
B.
1s²
C.
2s¹
D.
2p¹
Correct Answer:
1s¹
Explanation:
Hydrogen has one electron, and this electron occupies the lowest-energy 1s orbital.
5. Which particle is present in the nucleus of protium, the most common hydrogen isotope?
A.
One proton only
B.
One neutron only
C.
One proton and one neutron
D.
Two protons
Correct Answer:
One proton only
Explanation:
Protium has one proton and no neutron in its nucleus.
6. What is the mass number of deuterium, an isotope of hydrogen?
A.
1
B.
2
C.
3
D.
4
Correct Answer:
2
Explanation:
Deuterium contains one proton and one neutron, giving it a mass number of 2.
7. Which hydrogen isotope contains one proton and two neutrons?
A.
Protium
B.
Deuterium
C.
Tritium
D.
Hydrogen ion
Correct Answer:
Tritium
Explanation:
Tritium is hydrogen-3 and contains one proton plus two neutrons.
8. What is the charge of a hydrogen nucleus?
A.
0
B.
-1
C.
+1
D.
+2
Correct Answer:
+1
Explanation:
The hydrogen nucleus contains one positively charged proton and no electron, so its charge is +1.
9. Which subatomic particle determines the atomic number of hydrogen?
A.
Electron
B.
Neutron
C.
Proton
D.
Nucleus
Correct Answer:
Proton
Explanation:
The atomic number of an element is determined by the number of protons in its nucleus.
10. How many neutrons are present in a deuterium atom?
A.
0
B.
1
C.
2
D.
3
Correct Answer:
1
Explanation:
Deuterium has a mass number of 2 and one proton, so it contains one neutron.
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