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The electronic configuration of an element M is 2, 8, 2. In modern periodic table, the element M is placed in

A4th group

B2nd group

C14th group

D18th group

Answer:

B. 2nd group

Read Explanation:

  • The number of shells equals the period number of that element.
  • The number of valence electrons indicates the group of that element.

Example:

  • Electronic Configuration of Oxygen – 2, 6
  • It has 2 shells and 6 valence electrons. So it belongs to 2nd period and 6th group.

Note:

  • In the question given that, the electronic configuration is 2,8,2.
  • It has 3 shells and 2 valence electrons. So it belongs to 3rd period and 2nd group.
  • In modern periodic table, the element M is placed in 3rd period and 2nd group.

Related Questions:

സ്വർണത്തിന്റെ അറ്റോമിക ചിഹ്നം ഏത്?

Consider the statements below and identify the correct answer.

  1. Statement-I: Modern periodic table has 18 vertical columns known as groups.
  2. Statement-II: Modern periodic table has 7 horizontal rows known as periods.
    According to Dobereiner,________?
    Modern periodic table was prepared by
    ആവർത്തനപ്പട്ടികയിലെ ഏത് ബ്ലോക്കിലാണ് അന്തസംക്രമണ മൂലകങ്ങൾ കാണപ്പെടുന്നത് ?