Class X Chemistry Chapter 1: Periodic Table INTEXT Question 1
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Questions and Answers

What did Henry Moseley state in the modern periodic law?

  • The properties of elements are the periodic functions of their group number.
  • The properties of elements are the periodic functions of their atomic mass.
  • The properties of elements are the periodic functions of their valency.
  • The properties of elements are the periodic functions of their atomic number. (correct)

    • What is the definition of valency?

  • The number of electrons in the innermost shell of an atom.
  • The number of protons in the nucleus of an atom.
  • The combining capacity of the atom of an element. (correct)
  • The total number of electrons in an atom.

    • How many periods does the modern periodic table have?

  • 7 (correct)
  • 6
  • 8
  • 9

    • Why do Group 1 elements have valency 1?

    <p>They have 1 electron in their outermost orbital.</p> Signup and view all the answers

    What determines the valency of an element?

    <p>The number of electrons in the outermost shell.</p> Signup and view all the answers

    What is a periodic table?

    <p>A tabular arrangement of elements highlighting regular trends in their properties.</p> Signup and view all the answers

    In the periodic table, what are the horizontal rows known as?

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

    What is the reason for periodicity in the periodic table?

    <p>Electronic configuration</p> Signup and view all the answers

    How does the number of valence electrons change as you move from left to right across a period in the periodic table?

    <p>Increases by one</p> Signup and view all the answers

    Which statement about elements in the same group is correct?

    <p>Equal valency</p> Signup and view all the answers

    Name two elements classified as halogens in the periodic table.

    <p>Fluorine and Neon</p> Signup and view all the answers

    Which elements are placed at the extreme right of the periodic table?

    <p>Noble gases</p> Signup and view all the answers

    Which type of elements have their outermost shell complete?

    <p>Noble gases</p> Signup and view all the answers

    Which element has two outermost shells incomplete?

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

    What is the valency of elements in Group 1?

    <p>1</p> Signup and view all the answers

    Study Notes

    Periodic Table and Valency

    • Henry Moseley stated that the elements should be arranged in a periodic table according to their atomic numbers.
    • Definition of valency: The number of electrons an element can lose or gain to form a bond with another atom.
    • The modern periodic table has 7 periods.

    Valency and Groups

    • Group 1 elements have valency 1 because they can lose one electron to form a bond with another atom.
    • The valency of an element is determined by the number of electrons it can lose or gain to form a bond with another atom.
    • Elements in the same group have the same valency because they have the same number of electrons in their outermost shell.

    Periodic Table Structure

    • A periodic table is a tabular arrangement of elements according to their atomic numbers, electron configurations, and recurring chemical properties.
    • The horizontal rows in the periodic table are known as periods.
    • The reason for periodicity in the periodic table is the recurring pattern of similar chemical properties in elements due to the same number of electrons in their outermost shell.

    Electronic Configuration

    • As you move from left to right across a period in the periodic table, the number of valence electrons increases by one in each element.
    • Elements in the same group have the same number of electrons in their outermost shell.

    Element Classification

    • Halogens are elements classified as Group 17 in the periodic table, and two examples are Fluorine (F) and Chlorine (Cl).
    • Elements placed at the extreme right of the periodic table are Noble Gases.
    • Noble Gases have their outermost shell complete.
    • Carbon is an element that has two outermost shells incomplete.
    • The valency of elements in Group 1 is 1.

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    Description

    Test your understanding of Periodic Table concepts with this question from Class X Chemistry Chapter 1. The question covers the modern periodic law and the structure of the periodic table.

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