1. Who developed the modern periodic table?
A) John Dalton
B) J.J. Thomson
C) Dmitri Mendeleev
D) Ernest Rutherford
Answer: C) Dmitri Mendeleev
2. The modern periodic table is arranged according to:
A) Atomic mass
B) Atomic number
C) Density
D) Valency only
Answer: B) Atomic number
3. Horizontal rows in the periodic table are called:
A) Groups
B) Families
C) Periods
D) Blocks
Answer: C) Periods
4. Vertical columns in the periodic table are called:
A) Series
B) Groups
C) Periods
D) Shells
Answer: B) Groups
5. How many periods are there in the modern periodic table?
A) 6
B) 7
C) 8
D) 9
Answer: B) 7
6. How many groups are there in the modern periodic table?
A) 16
B) 17
C) 18
D) 19
Answer: C) 18
7. Elements in the same group have similar:
A) Atomic size
B) Physical state
C) Chemical properties
D) Atomic mass
Answer: C) Chemical properties
8. Group 1 elements are known as:
A) Halogens
B) Noble gases
C) Alkali metals
D) Alkaline earth metals
Answer: C) Alkali metals
9. Group 17 elements are called:
A) Alkali metals
B) Halogens
C) Noble gases
D) Transition metals
Answer: B) Halogens
10. Group 18 elements are known as:
A) Noble gases
B) Halogens
C) Alkali metals
D) Metalloids
Answer: A) Noble gases
11. The atomic number represents the number of:
A) Neutrons
B) Protons
C) Electrons + Neutrons
D) Shells
Answer: B) Protons
12. Elements are arranged in increasing order of:
A) Atomic size
B) Atomic mass
C) Atomic number
D) Valency
Answer: C) Atomic number
13. The first element in the periodic table is:
A) Helium
B) Hydrogen
C) Lithium
D) Oxygen
Answer: B) Hydrogen
14. The most reactive metals are found in:
A) Group 1
B) Group 14
C) Group 17
D) Group 18
Answer: A) Group 1
15. The most reactive non-metals belong to:
A) Group 2
B) Group 15
C) Group 17
D) Group 18
Answer: C) Group 17
16. Elements in a period have the same number of:
A) Valence electrons
B) Neutrons
C) Electron shells
D) Protons
Answer: C) Electron shells
17. Metals are generally located on the:
A) Right side
B) Left side
C) Middle only
D) Top
Answer: B) Left side
18. Non-metals are generally located on the:
A) Left side
B) Bottom
C) Right side
D) Center
Answer: C) Right side
19. The zig-zag line in the periodic table separates:
A) Metals and non-metals
B) Groups and periods
C) Solids and gases
D) Blocks
Answer: A) Metals and non-metals
20. The elements between Groups 3 and 12 are called:
A) Representative elements
B) Noble gases
C) Transition elements
D) Metalloids
Answer: C) Transition elements
21. The periodic law states that properties of elements are periodic functions of their:
A) Atomic mass
B) Atomic number
C) Density
D) Valency
Answer: B) Atomic number
22. The smallest period in the periodic table contains:
A) 2 elements
B) 8 elements
C) 18 elements
D) 32 elements
Answer: A) 2 elements
23. The second period contains how many elements?
A) 2
B) 4
C) 8
D) 10
Answer: C) 8
24. Lanthanides are placed separately at the bottom because:
A) They are gases
B) They are radioactive
C) To keep the table compact
D) They are non-metals
Answer: C) To keep the table compact
25. The elements in Group 2 are called:
A) Halogens
B) Alkaline earth metals
C) Transition metals
D) Noble gases
Answer: B) Alkaline earth metals
26. Atomic size generally decreases across a period from:
A) Right to left
B) Top to bottom
C) Left to right
D) Bottom to top
Answer: C) Left to right
27. Atomic size generally increases down a group because:
A) Nuclear charge decreases
B) More electron shells are added
C) Electrons decrease
D) Protons decrease
Answer: B) More electron shells are added
28. Elements that show properties of both metals and non-metals are called:
A) Transition metals
B) Halogens
C) Metalloids
D) Noble gases
Answer: C) Metalloids
29. The central block of the periodic table is known as the:
A) s-block
B) p-block
C) d-block
D) f-block
Answer: C) d-block
30. The periodic table helps scientists to:
A) Predict properties of elements
B) Measure atomic mass directly
C) Count neutrons
D) Identify isotopes only
Answer: A) Predict properties of elements