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Periodic Classification of Elements - 2 (Class IX)

Covers periodic table development (Dobereiner's triads, Newlands' law of octaves, Mendeleev's table) and modern periodic trends including electronegativity, metallic character, and nuclear charge.

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

According to Dobereiner’s law, the atomic masses of the middle elements were equal to the

  1. sum of the atomic masses of the other two elements
  2. arithmetic mean of the atomic masses of the other two elements
  3. atomic mass of the first element of the same group
  4. atomic mass of the last element of the same group
Question 2 Multiple Choice (Single Answer)

Modern periodic table is based on

  1. atomic number
  2. atomic mass
  3. valency
  4. atomic radius
Question 3 Multiple Choice (Single Answer)

Which of the following elements resembles beryllium according to Newlands’ law of octaves?

  1. Sodium
  2. Magnesium
  3. Calcium
  4. Aluminium
Question 4 Multiple Choice (Single Answer)

Why is Newlands' method of classification of elements known as law of octaves?

  1. Because it could classify only eight elements
  2. Because every eighth element had the properties similar to the first
  3. Because the classification was based on the atomic masses of the element
  4. Because the elements were classified in eight groups
Question 5 Multiple Choice (Single Answer)

Which of the following elements are placed in an inverted sequence in Mendeleev’s periodic table?

  1. Cobalt and nickel
  2. Sulphur and chlorine
  3. Scandium and titanium
  4. Magnesium and aluminium
Question 6 Multiple Choice (Single Answer)

The vertical columns in a periodic table are called

  1. periods
  2. groups
  3. lanthanides
  4. actinides
Question 7 Multiple Choice (Single Answer)

The element ‘eka-boron’, predicted by Mendeleev, is

  1. scandium
  2. gallium
  3. aluminium
  4. silicon
Question 8 Multiple Choice (Single Answer)

The numbers of groups and periods present in the modern periodic table are ____ and ____, respectively.

  1. 16, 7
  2. 6, 16
  3. 18, 7
  4. 18, 6
Question 9 Multiple Choice (Single Answer)

Which of the following statements is/are not true about Mendeleev's periodic table?

(a) He started his work with 65 elements known at that time.
(b) He examined the relationship between the atomic masses of the elements and their physical and chemical properties.
(c) Mendeleev gave a specific position to isotopes also in his periodic table.

  1. Only (a)
  2. Only (b)
  3. Only (c)
  4. Both (a) and (c)
Question 10 Multiple Choice (Single Answer)

Which of the following has the lowest electronegativity?

  1. F
  2. He
  3. Hg
  4. Cl
Question 11 Multiple Choice (Single Answer)

Which of the following is the correct order of arrangement of elements in a period according to their metallic character?

  1. Na < Li < K < Cs < Rb
  2. Rb < Li < K < Na < Cs
  3. Li < Na < K < Rb < Cs
  4. Na < Li < Rb < Cs < K
Question 12 Multiple Choice (Single Answer)

Which of the following is the correct trend of metallic character when there is an increase in atomic number?

  1. Decreases in a period and increases in a group
  2. Increases in a period and decreases in a group
  3. Increases both in a period and a group
  4. Decreases both in a period and a group
Question 13 Multiple Choice (Single Answer)

Which of the following elements has the highest electropositive nature?

  1. Cu
  2. Cs
  3. K
  4. Ba
Question 14 Multiple Choice (Single Answer)

As we move from one element to the next in a respective period in the modern periodic table, the atomic number increases by

  1. four
  2. three
  3. two
  4. one
Question 15 Multiple Choice (Single Answer)

As we move from left to right across the periodic table, the net nuclear charge of atoms

  1. increases
  2. always remains the same
  3. decreases
  4. always varies
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