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JEE Main Atomic Structure and Valency — practice questions

Explore 30 free Atomic Structure and Valency questions in JEE Main Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Atomic Structure and Valency questions and exercises with answers

Showing questions 1–30 of 30.

Dobereiner's groups of three similar elements were called:Read the answer and worked solution →In a triad the atomic weight of the middle element is about:Read the answer and worked solution →The Law of Triads was set aside as mere:Read the answer and worked solution →Newlands put forward the Law of Octaves in:Read the answer and worked solution →Under the Law of Octaves, properties repeat at every:Read the answer and worked solution →The Law of Octaves held good only up to:Read the answer and worked solution →Mendeleev handled undiscovered elements by leaving:Read the answer and worked solution →Mendeleev predicted the existence of gallium and:Read the answer and worked solution →Moseley found regularities in the characteristic:Read the answer and worked solution →Moseley showed the more fundamental property to be:Read the answer and worked solution →The Modern Periodic Law makes properties periodic functions of:Read the answer and worked solution →The atomic number of an element is equal to its:Read the answer and worked solution →The s-block elements are best described as:Read the answer and worked solution →An alkali metal loses its outer electron to form:Read the answer and worked solution →The s-block metals are never found pure because of their:Read the answer and worked solution →The p-block elements belong to groups:Read the answer and worked solution →The s-block and p-block together are called the:Read the answer and worked solution →Noble gases have completely filled valence shells and show:Read the answer and worked solution →The d-block elements occupy groups:Read the answer and worked solution →The d-block is marked by the filling of:Read the answer and worked solution →Valence of a representative element usually equals the number of:Read the answer and worked solution →The term now often used in place of valence is:Read the answer and worked solution →Order the steps to the periodic tableRead the answer and worked solution →Type the year or the groupRead the answer and worked solution →Match each idea to its scientistRead the answer and worked solution →s-block or d-blockRead the answer and worked solution →True or false on the periodic tableRead the answer and worked solution →Quick picks on periodicityRead the answer and worked solution →Fill the gaps on periodicityRead the answer and worked solution →Spot the one that does not fitRead the answer and worked solution →

Worked practice questions

Dobereiner's groups of three similar elements were called:

  1. Triads
  2. Octaves
  3. Periods
  4. Blocks
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Correct answer: A. Triads

1. He noticed similar properties running in sets of three elements. 2. Each such set of three was called a triad. 3. He set these out by 1829. _Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._

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In a triad the atomic weight of the middle element is about:

  1. Less than both
  2. Half way between
  3. Twice the first
  4. Equal to the last
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Correct answer: B. Half way between

1. The three elements of a triad are listed by atomic weight. 2. The middle one sits about half way between the outer two. 3. Its properties fall in between theirs as well. _Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._

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The Law of Triads was set aside as mere:

  1. Coincidence
  2. A basic law
  3. An exact rule
  4. A firm trend
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Correct answer: A. Coincidence

1. The pattern was tested against the elements then known. 2. It worked for only a few of them. 3. So it was dismissed as coincidence. _Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._

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