Chemistry – Periodic Table of Elements

1. Which statement is correct regarding the properties of elements according to Mendeleev’s Periodic Law?

  1. The properties of elements are a periodic function of their atomic numbers
  2. The properties of elements are a periodic function of their electron configurations
  3. The properties of elements are a periodic function of their isotopic masses
  4. The properties of elements are a periodic function of their atomic masses
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Answer: Option D. The properties of elements are a periodic function of their atomic masses

2. Which elements are the most and least electronegative in the periodic table?

  1. Oxygen and Sodium
  2. Chlorine and Potassium
  3. Fluorine and Francium
  4. Nitrogen and Calcium
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Answer: Option C. Fluorine and Francium

3. In Dobereiner’s Triads, which value is equal to the atomic weight of the middle element?

  1. The mean of the atomic weights of the other two elements
  2. The sum of the atomic weights of the other two elements
  3. The difference between the atomic weights of the other two elements
  4. The product of the atomic weights of the other two elements
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Answer: Option A. The mean of the atomic weights of the other two elements

4. Which of the following elements are commonly found in a free state?

  1. Group 9 elements
  2. Group 11 elements
  3. Group 12 elements
  4. Group 14 elements
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Answer: Option B. Group 11 elements

5. Which property does not increase when moving from left to right across a period in the periodic table?

  1. Atomic radius
  2. Ionization energy
  3. Electronegativity
  4. Electron affinity
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Answer: Option A. Atomic radius