Questions on The Periodic Table
30 Multiple-Choice Questions: The Periodic Table
1. Who is credited with creating the first widely recognized periodic table?
A) John Dalton
B) J.J. Thomson
C) Dmitri Mendeleev
D) Niels Bohr
E) Antoine Lavoisier
2. How are elements arranged in the modern periodic table?
A) By atomic mass
B) By number of neutrons
C) Alphabetically
D) By atomic number
E) By density
3. What does each period in the periodic table represent?
A) Elements with similar properties
B) Number of neutrons
C) Number of energy levels
D) Valence electrons
E) Mass number
4. What is a group (or family) on the periodic table?
A) A column of elements with similar properties
B) A row of elements with different properties
C) A mixture of elements
D) A block of radioactive elements
E) A section of synthetic elements
5. Which group contains the noble gases?
A) Group 1
B) Group 2
C) Group 13
D) Group 17
E) Group 18
6. Which of the following is an alkali metal?
A) Calcium
B) Sodium
C) Iron
D) Helium
E) Aluminum
7. Which group contains the alkaline earth metals?
A) Group 1
B) Group 2
C) Group 14
D) Group 17
E) Group 18
8. Which of the following elements is a halogen?
A) Oxygen
B) Argon
C) Chlorine
D) Neon
E) Sulfur
9. Elements in the same group have the same number of:
A) Protons
B) Neutrons
C) Energy levels
D) Valence electrons
E) Orbitals
10. Which is a transition metal?
A) Lithium
B) Beryllium
C) Iron
D) Fluorine
E) Krypton
11. Which block contains the lanthanides?
A) s-block
B) p-block
C) d-block
D) f-block
E) g-block
12. Which of the following is a metalloid?
A) Silicon
B) Sodium
C) Iron
D) Bromine
E) Argon
13. Which element is a gas at room temperature?
A) Bromine
B) Iodine
C) Chlorine
D) Lithium
E) Magnesium
14. Which of the following elements is the most reactive metal?
A) Sodium
B) Potassium
C) Calcium
D) Francium
E) Aluminum
15. Which of the following elements is the most reactive nonmetal?
A) Oxygen
B) Fluorine
C) Nitrogen
D) Chlorine
E) Hydrogen
16. What is the trend for atomic radius across a period?
A) Increases
B) Decreases
C) Remains the same
D) Increases then decreases
E) No trend
17. What is the trend for ionization energy across a period?
A) Decreases
B) Increases
C) Remains the same
D) Decreases then increases
E) No pattern
18. Which element has the highest electronegativity?
A) Oxygen
B) Nitrogen
C) Fluorine
D) Chlorine
E) Carbon
19. Elements in the same period have:
A) Same chemical properties
B) Same number of energy levels
C) Same number of valence electrons
D) Same mass
E) Same group number
20. What is the general electron configuration for elements in group 1?
A) ns²
B) ns²np¹
C) ns¹
D) ns²np⁶
E) ns²nd¹
21. What are the horizontal rows in the periodic table called?
A) Groups
B) Periods
C) Blocks
D) Columns
E) Shells
22. Which of the following elements is a p-block element?
A) Sodium
B) Calcium
C) Phosphorus
D) Scandium
E) Chromium
23. Which period is element oxygen in?
A) 1
B) 2
C) 3
D) 4
E) 5
24. What do elements in Group 18 have in common?
A) One valence electron
B) Very reactive
C) Nonmetals with full outer shells
D) Conduct electricity
E) Found in solids
25. Which group forms +1 ions most easily?
A) Group 2
B) Group 13
C) Group 17
D) Group 1
E) Group 18
26. What property is shared by all metals?
A) Low melting point
B) Poor conductor of electricity
C) Malleability and ductility
D) Found only as gases
E) Reactivity with noble gases
27. Which group contains elements that form salts with metals?
A) Group 1
B) Group 2
C) Group 14
D) Group 17
E) Group 18
28. What do the elements in the f-block include?
A) Alkali metals
B) Halogens
C) Noble gases
D) Lanthanides and actinides
E) Nonmetals
29. What is the main characteristic of transition metals?
A) Poor conductivity
B) Low reactivity
C) Incomplete d-orbitals
D) All are gases
E) Same number of valence electrons
30. Which of these is true about metalloids?
A) They are all nonmetals
B) They are completely metallic
C) They are good conductors like metals
D) They have properties of both metals and nonmetals
E) They are found only in liquids
- Questions on Metals and Non-Metals
- Questions on Metalloids
- Questions on Hydrogen and Alkali Metals
- Questions on Alkaline Earth Metals (Group 2)
Answers and Explanations
1. C – Mendeleev arranged elements by atomic mass and predicted new elements.
2. D – Modern table is ordered by increasing atomic number.
3. C – Period = energy levels/shells
4. A – Groups are columns with similar chemical properties.
5. E – Group 18 are the noble gases (e.g., He, Ne, Ar).
6. B – Sodium is in Group 1 (alkali metals).
7. B – Group 2 contains the alkaline earth metals.
8. C – Chlorine is a halogen (Group 17).
9. D – Elements in a group share valence electrons.
10. C – Iron is a d-block transition metal.
11. D – Lanthanides and actinides are in the f-block.
12. A – Silicon is a classic metalloid.
13. C – Chlorine is a greenish gas at room temperature.
14. D – Francium is the most reactive alkali metal.
15. B – Fluorine is the most electronegative and reactive nonmetal.
16. B – Atomic radius decreases across a period.
17. B – Ionization energy increases across a period.
18. C – Fluorine has the highest electronegativity.
19. B – Periods share the same number of energy levels.
20. C – Group 1 elements have ns¹ configuration.
21. B – Periods = horizontal rows.
22. C – Phosphorus is in Group 15 (p-block).
23. B – Oxygen is in Period 2.
24. C – Group 18 elements have full outer shells.
25. D – Group 1 metals lose one electron easily.
26. C – Metals are malleable and ductile.
27. D – Group 17 halogens form salts (NaCl, etc.)
28. D – Lanthanides and actinides make up the f-block.
29. C – Transition metals have incomplete d-orbitals.
30. D – Metalloids have both metallic and nonmetallic properties.
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