تركيب الذرة: 17 MCQs with answers
All 17 multiple-choice questions from this kit, free and with no sign-up.
Warm-up · 8 questions
Q1. What is the central part of an atom called?
BeginnerShow answer & explanation
Nucleus
The nucleus is the dense, central region of an atom containing protons and neutrons.
Q2. Which subatomic particle carries a positive charge?
BeginnerShow answer & explanation
Proton
Protons are positively charged particles found in the nucleus.
Q3. What is the charge of an electron?
BeginnerShow answer & explanation
Negative
Electrons have a negative charge and orbit the nucleus.
Q4. Which particle has no charge (neutral)?
BeginnerShow answer & explanation
Neutron
Neutrons are neutral particles located in the nucleus.
Q5. How many electrons can the first shell (K) hold?
BeginnerShow answer & explanation
2
The first shell (K) can hold a maximum of 2 electrons.
Q6. What is the maximum number of electrons in the second shell (L)?
BeginnerShow answer & explanation
8
The second shell (L) can hold up to 8 electrons.
Q7. The nucleus of an atom contains protons and neutrons.
BeginnerShow answer & explanation
True
The nucleus is composed of protons (positive) and neutrons (neutral).
Q8. The number of electrons in an atom is always equal to the number of neutrons.
BeginnerShow answer & explanation
False
In a neutral atom, the number of electrons equals the number of protons, not necessarily neutrons.
Building up · 8 questions
Q9. The atomic number of an atom is equal to the number of what?
IntermediateShow answer & explanation
Protons
The atomic number (Z) is defined as the number of protons in the nucleus.
Q10. What is the mass number of an atom?
IntermediateShow answer & explanation
Number of protons + neutrons
The mass number (A) is the total number of protons and neutrons in the nucleus.
Q11. Which of the following represents the correct distribution of electrons for an atom with 11 electrons?
IntermediateShow answer & explanation
2, 8, 1
The first shell holds 2, the second holds 8, and the remaining 1 goes to the third shell.
Q12. What is the valency of an atom with 8 electrons in its outermost shell?
IntermediateShow answer & explanation
0
An atom with a full outermost shell (8 electrons) is stable and has zero valency.
Q13. Which subatomic particle is responsible for the chemical properties of an atom?
IntermediateShow answer & explanation
Electron
Electrons, especially those in the outermost shell, determine how an atom interacts chemically.
Q14. What is the valency of an atom with 7 electrons in its outermost shell?
IntermediateShow answer & explanation
1
An atom with 7 outer electrons needs 1 more to achieve a stable octet, so its valency is 1.
Q15. Which of the following is the correct electron distribution for an atom of oxygen (8 electrons)?
IntermediateShow answer & explanation
2, 6
Oxygen has 8 electrons: 2 in the first shell and 6 in the second shell.
Q16. What is the valency of an atom with 6 electrons in its outermost shell?
IntermediateShow answer & explanation
2
An atom with 6 outer electrons needs 2 more to complete its octet, so its valency is 2.
Topper level · 1 questions
Q17. What is the charge of an atom that has 8 protons and 10 electrons?
AdvancedShow answer & explanation
Negative
With more electrons than protons, the atom has a net negative charge.
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