AP POLYCET CHEMISTRY Multiple Choice Questions (MCQs)

AP POLYCET Chemistry: Classification of Elements - The Periodic Table

1. Who proposed the modern periodic law?
   A) Mendeleev
   B) Newlands
   C) Moseley
   D) Lavoisier
   Answer: C) Moseley
2. Which of the following is true for elements in the same group of the periodic table?
   A) They have the same atomic mass
   B) They have similar chemical properties
   C) They have the same number of neutrons
   D) They have different valence electrons
   Answer: B) They have similar chemical properties
3. In the modern periodic table, elements are arranged in order of increasing:
   A) Atomic number
   B) Atomic mass
   C) Neutron number
   D) Valency
   Answer: A) Atomic number
4. The periodic table is divided into:
   A) Periods and Groups
   B) Rows and Columns
   C) Blocks and Sub-blocks
   D) Rows and Groups
   Answer: A) Periods and Groups
5. The element with atomic number 11 belongs to which group of the periodic table?
   A) Group 1
   B) Group 2
   C) Group 3
   D) Group 17
   Answer: A) Group 1
6. Which of the following elements has the highest atomic number?
   A) Oxygen
   B) Carbon
   C) Sodium
   D) Uranium
   Answer: D) Uranium
7. Which element is placed in Group 17 and Period 2 of the periodic table?
   A) Fluorine
   B) Chlorine
   C) Bromine
   D) Iodine
   Answer: A) Fluorine
8. Which element is known as a noble gas?
   A) Helium
   B) Oxygen
   C) Nitrogen
   D) Hydrogen
   Answer: A) Helium
9. Which of the following is the main characteristic of the noble gases?
   A) They are highly reactive
   B) They have completely filled valence shells
   C) They form acidic oxides
   D) They have no neutrons
   Answer: B) They have completely filled valence shells
10. Which of the following elements is classified as a transition metal?
    A) Sodium
    B) Iron
    C) Oxygen
    D) Calcium
    Answer: B) Iron
11. The atomic radius of elements generally:
    A) Increases as you move across a period
    B) Increases as you move down a group
    C) Decreases as you move down a group
    D) Decreases as you move across a period
    Answer: B) Increases as you move down a group
12. Which of the following elements is a halogen?
    A) Sodium
    B) Chlorine
    C) Helium
    D) Calcium
    Answer: B) Chlorine
13. Which of the following is a characteristic of metals in the periodic table?
    A) They are poor conductors of electricity
    B) They have high ionization energy
    C) They are malleable and ductile
    D) They are non-lustrous
    Answer: C) They are malleable and ductile
14. The number of periods in the modern periodic table is:
    A) 7
    B) 8
    C) 18
    D) 12
    Answer: A) 7
15. Which group of elements is known as the alkali metals?
    A) Group 1
    B) Group 2
    C) Group 17
    D) Group 18
    Answer: A) Group 1

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