Punjab Chemistry Online 9th Class Test Lesson 2 Structure of Atom

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According to Dalton that An Atom is and invisible, hard dense sphere, Atoms of the same element are alike, Atoms combine in different ways to form a compound. In 1932 James chadwick discovered a neutron. When he bombarded alpha particles on a beryllium target He observed that highly penetrating radiations were produced.

Structure of Atom Lesson 2 Chemistry Online Test 9th Below




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3 Responses to “Punjab Chemistry Online 9th Class Test Lesson 2 Structure of Atom”

  1. Moon Numaan

    Dec 18. 2016

    Yes 83%

    Reply to this comment
  2. Arsalan Rajpoot

    Mar 20. 2016

    yes 58% 🙁

    Reply to this comment

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