1. What is an element?
A) A mixture of compounds
B) A pure substance made of only one kind of atom
C) A combination of metals
D) A physical state of matter
Answer: B
2. The smallest particle of an element that retains its properties is called:
A) Molecule
B) Proton
C) Atom
D) Ion
Answer: C
3. Which of the following is a metal?
A) Oxygen
B) Nitrogen
C) Iron
D) Chlorine
Answer: C
4. Which of the following is a non-metal?
A) Copper
B) Sulfur
C) Aluminum
D) Zinc
Answer: B
5. The chemical symbol of Sodium is:
A) So
B) Na
C) S
D) N
Answer: B
6. Which element is represented by the symbol “O”?
A) Gold
B) Oxygen
C) Osmium
D) Oxide
Answer: B
7. The most abundant element in the Earth’s crust is:
A) Hydrogen
B) Oxygen
C) Carbon
D) Nitrogen
Answer: B
8. Which element is a noble gas?
A) Helium
B) Hydrogen
C) Chlorine
D) Sodium
Answer: A
9. The atomic number of an element represents the number of:
A) Neutrons
B) Electrons only
C) Protons
D) Molecules
Answer: C
10. Which element is liquid at room temperature?
A) Bromine
B) Iron
C) Carbon
D) Calcium
Answer: A
11. The lightest element in the periodic table is:
A) Helium
B) Lithium
C) Hydrogen
D) Oxygen
Answer: C
12. Which element is essential for respiration?
A) Nitrogen
B) Oxygen
C) Hydrogen
D) Carbon
Answer: B
13. The symbol “Fe” stands for:
A) Fluorine
B) Iron
C) Francium
D) Fermium
Answer: B
14. Which element is commonly used in electric wires?
A) Sulfur
B) Phosphorus
C) Copper
D) Carbon
Answer: C
15. Which of the following is a metalloid?
A) Silicon
B) Gold
C) Oxygen
D) Neon
Answer: A
16. The element with atomic number 1 is:
A) Helium
B) Hydrogen
C) Lithium
D) Carbon
Answer: B
17. Which element is used in pencils?
A) Lead
B) Carbon
C) Zinc
D) Tin
Answer: B
18. The heaviest naturally occurring element is:
A) Uranium
B) Gold
C) Mercury
D) Lead
Answer: A
19. Which element is required for strong bones and teeth?
A) Potassium
B) Sodium
C) Calcium
D) Iron
Answer: C
20. The chemical symbol “Cl” stands for:
A) Calcium
B) Chlorine
C) Carbon
D) Copper
Answer: B
21. Which gas is filled in balloons to make them float?
A) Oxygen
B) Nitrogen
C) Helium
D) Hydrogen
Answer: C
22. Which element is used in thermometers?
A) Mercury
B) Silver
C) Aluminum
D) Sodium
Answer: A
23. Elements are arranged in the periodic table according to their:
A) Mass only
B) Color
C) Atomic number
D) Density
Answer: C
24. Which element is a halogen?
A) Argon
B) Chlorine
C) Sodium
D) Magnesium
Answer: B
25. The symbol “Au” represents:
A) Silver
B) Gold
C) Aluminum
D) Argon
Answer: B
26. Which element is commonly used in fertilizers and represented by “N”?
A) Neon
B) Nickel
C) Nitrogen
D) Niobium
Answer: C
27. The element used in making glass is:
A) Silicon
B) Iron
C) Sodium
D) Carbon
Answer: A
28. Which element is magnetic in nature?
A) Oxygen
B) Nitrogen
C) Iron
D) Helium
Answer: C
29. The atomic number of Carbon is:
A) 12
B) 6
C) 8
D) 14
Answer: B
30. Which element is present in all organic compounds?
A) Hydrogen
B) Oxygen
C) Nitrogen
D) Carbon
Answer: D