AP POLYCET CHEMISTRY Multiple Choice Questions (MCQs)
AP POLYCET Chemistry - Classification of Elements (MCQs) - Questions 16 to 30
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16. Who proposed the periodic law?
- A) Mendeleev
- B) Moseley
- C) Newlands
- D) Lavoisier
Answer: A) Mendeleev
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17. Which of the following is the largest element in Period 2 of the periodic table?
- A) Lithium
- B) Beryllium
- C) Carbon
- D) Fluorine
Answer: A) Lithium
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18. The modern periodic table is based on:
- A) Atomic mass
- B) Atomic number
- C) Mass number
- D) Neutron number
Answer: B) Atomic number
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19. Which of the following is an example of a transition metal?
- A) Sodium
- B) Iron
- C) Chlorine
- D) Neon
Answer: B) Iron
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20. Which of the following groups is called the alkaline earth metals?
- A) Group 1
- B) Group 2
- C) Group 13
- D) Group 17
Answer: B) Group 2
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21. Which element has the highest electronegativity in Period 2?
- A) Lithium
- B) Fluorine
- C) Oxygen
- D) Nitrogen
Answer: B) Fluorine
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22. Which of the following is a characteristic of non-metals?
- A) Malleable
- B) High melting points
- C) Poor conductors of electricity
- D) Ductile
Answer: C) Poor conductors of electricity
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23. Which element is found in Period 3, Group 1 of the periodic table?
- A) Sodium
- B) Magnesium
- C) Chlorine
- D) Potassium
Answer: A) Sodium
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24. The element with atomic number 12 belongs to which group?
- A) Group 1
- B) Group 2
- C) Group 17
- D) Group 18
Answer: B) Group 2
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25. Which of the following is the smallest in atomic size?
- A) Sodium
- B) Magnesium
- C) Aluminum
- D) Chlorine
Answer: D) Chlorine
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26. Which of the following is a characteristic of noble gases?
- A) They are highly reactive.
- B) They have a full outer shell of electrons.
- C) They form ionic compounds.
- D) They have low ionization energies.
Answer: B) They have a full outer shell of electrons.
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27. Which of the following trends occurs as you move down a group in the periodic table?
- A) Atomic size decreases
- B) Ionization energy increases
- C) Electronegativity increases
- D) Atomic size increases
Answer: D) Atomic size increases
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28. Which group of elements contains elements like Lithium, Sodium, and Potassium?
- A) Alkaline earth metals
- B) Transition metals
- C) Alkali metals
- D) Noble gases
Answer: C) Alkali metals
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29. What is the general trend in ionization energy as you move across a period?
- A) It increases
- B) It decreases
- C) It remains constant
- D) It becomes zero
Answer: A) It increases
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30. Which of the following is the correct order of atomic size for the elements in Period 2?
- A) Li > Be > B > C > N > O > F > Ne
- B) Ne > F > O > N > C > B > Be > Li
- C) Li < Be < B < C < N < O < F < Ne
- D) Li > Be > B > C > N < O > F < Ne
Answer: A) Li > Be > B > C > N > O > F > Ne
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