Periodic Table
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Questions and Answers

What is the primary factor that determines the length of periods in the periodic table?

  • Arrangement of electrons in different orbits (correct)
  • Atomic weight of the elements
  • Similar properties of elements
  • Number of electrons in the outermost orbit

    • Why does hydrogen exhibit dual behavior?

  • Due to its ability to gain or lose an electron (correct)
  • Due to its electron configuration
  • Due to its position in the periodic table
  • Due to its atomic weight

    • What is the significance of the last member of each period being an inert gas?

  • It indicates the start of a new period
  • It explains the dissimilarity with halogens
  • It shows the similarity with alkali metals
  • It marks the end of a period (correct)

    • What is the purpose of Dobereiner's law of triads?

    <p>To classify elements into groups of three with similar properties</p> Signup and view all the answers

    What is the result of the inclusion of dissimilar elements in the same group but different subgroups?

    <p>Formation of subgroups</p> Signup and view all the answers

    What is the primary reason for the rare earth elements being placed in the same group in the periodic table?

    <p>They have the same number of valency electrons</p> Signup and view all the answers

    Which of the following groups in the periodic table has a special arrangement of elements due to lack of space?

    <p>VIII group</p> Signup and view all the answers

    What is the basis of classification of elements in the modern periodic table?

    <p>Atomic number</p> Signup and view all the answers

    Which of the following elements would occupy the same position in the periodic table?

    <p>Isotopes of the same element</p> Signup and view all the answers

    What is the advantage of using atomic number as the basis for classification of elements in the periodic table?

    <p>It eliminates the anomalies of Mendeleev's table</p> Signup and view all the answers

    What was the basis of Mendeleef's periodic table?

    <p>Atomic weight</p> Signup and view all the answers

    Which group of elements was added to Mendeleef's original table with the discovery of inert gases?

    <p>Zero group</p> Signup and view all the answers

    What is the current basis of the classification of elements in the modern periodic table?

    <p>Atomic number</p> Signup and view all the answers

    How are the elements arranged in Mendeleef's periodic table?

    <p>In order of increasing atomic weight</p> Signup and view all the answers

    How many horizontal rows are there in Mendeleef's periodic table?

    <p>7</p> Signup and view all the answers

    What is the likely reason for hydrogen's resemblance to both alkali metals and halogens?

    <p>It has one electron in its outermost orbit.</p> Signup and view all the answers

    What is the arrangement of elements in the periodic table based on?

    <p>Similar properties placed together.</p> Signup and view all the answers

    What is the significance of the last member of each period being an inert gas?

    <p>It indicates the completion of last orbits.</p> Signup and view all the answers

    Which of the following elements would likely exhibit dual behavior?

    <p>An element with one electron in its outermost orbit.</p> Signup and view all the answers

    What is the result of the periodic arrangement of elements?

    <p>Elements with similar properties are placed together.</p> Signup and view all the answers

    What is the effect of the shielding effect on a valence electron in a multi-electron atom?

    <p>It experiences less attraction from the nucleus</p> Signup and view all the answers

    What is the direction of change in atomic radius on moving from left to right in a period?

    <p>It decreases</p> Signup and view all the answers

    What is the relationship between the number of inner electrons and the magnitude of the shielding effect?

    <p>The shielding effect increases with an increase in inner electrons</p> Signup and view all the answers

    What is the term for the distance between the centre of the nucleus and the electrons in the last orbit?

    <p>Atomic radius</p> Signup and view all the answers

    In which block of elements does the magnitude of the screening constant increase with an increase in atomic number?

    <p>s- and p- block elements</p> Signup and view all the answers

    What is the primary reason for the rare earth elements having similar chemical behavior?

    <p>They have the same number of valency electrons</p> Signup and view all the answers

    What anomaly disappears when atomic number is taken as the basis for classification of elements?

    <p>Anomalous pairs of elements</p> Signup and view all the answers

    What is the characteristic of the electronic arrangement of rare earth elements?

    <p>2, 8, 18, (18 + x), 9, 2</p> Signup and view all the answers

    What justifies the placement of rare earth elements in the same group in the periodic table?

    <p>Same number of valency electrons</p> Signup and view all the answers

    What is the consequence of using atomic number as the basis for classification of elements?

    <p>Many anomalies of Mendeleef's table disappear</p> Signup and view all the answers

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