Short questions from classification of elements

 Answers to Questions

  • a. What is meant by classification of elements?
    • Grouping elements by shared properties.
    • Making the study of elements easy.
  • b. State the modern periodic law.
    • The physical and chemical properties of elements are a periodic function of their atomic numbers.
  • c. How many periods are there in the modern periodic table?
    • There are 7 horizontal rows called periods. 
  • d. What are noble gases?
    • Elements in Group 18 of the periodic table.
    • They are unreactive and stable gases like helium and neon. 
  • e. Why are alkali metals placed in Group 1?
    • They have one valence electron in their outer shell.
    • They share similar chemical properties. 
  • f. Why do noble gases have zero valency?
    • Their outermost electron shells are completely full.
    • They do not need to lose, gain, or share electrons.

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