Quiz questions:
1. What is the smallest unit of an element that retains the properties of that element?
- a) Proton
- b) Neutron
- c) Electron
- d) Atom
Answer: d) Atom
2. Which subatomic particle carries a positive charge?
- a) Proton
- b) Neutron
- c) Electron
- d) Nucleus
Answer: a) Proton
3. What is the total number of electrons in a neutral atom of oxygen (O)?
- a) 6
- b) 7
- c) 8
- d) 9
Answer: c) 8
4. The atomic number of an element is determined by the number of:
- a) Protons
- b) Neutrons
- c) Electrons
- d) Nucleons
Answer: a) Protons
5. What is the mass number of an atom equal to?
- a) The number of protons
- b) The number of electrons
- c) The sum of protons and neutrons
- d) The number of neutrons
Answer: c) The sum of protons and neutrons
6. Which of the following represents a diatomic molecule?
- a) H
- b) O2
- c) N2
- d) He
Answer: b) O2
7. What is the chemical formula for water?
- a) CO2
- b) H2O
- c) CH4
- d) O2
Answer: b) H2O
8. Which of the following is a noble gas?
- a) Oxygen (O)
- b) Helium (He)
- c) Carbon (C)
- d) Hydrogen (H)
Answer: b) Helium (He)
9. What type of bond forms when electrons are shared between atoms?
- a) Ionic bond
- b) Covalent bond
- c) Metallic bond
- d) Hydrogen bond
Answer: b) Covalent bond
10. What is the chemical symbol for the element potassium?
- a) K
- b) P
- c) Pt
- d) Ko
Answer: a) K
11. How many atoms are there in a molecule of methane (CH4)?
- a) 1
- b) 2
- c) 3
- d) 4
Answer: d) 4
12. Which of the following represents a compound?
- a) O2
- b) N2
- c) CO2
- d) H2
Answer: c) CO2
13. What is the atomic number of carbon (C)?
- a) 5
- b) 6
- c) 7
- d) 8
Answer: b) 6
14. What is the chemical formula for sulfuric acid?
- a) H2SO3
- b) HCl
- c) H2SO4
- d) SO2
Answer: c) H2SO4
15. Which of the following elements is a halogen?
- a) Sodium (Na)
- b) Chlorine (Cl)
- c) Calcium (Ca)
- d) Iron (Fe)
Answer: b) Chlorine (Cl)
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