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The formula of a chloride of a metal M is MCl3, the formula of the phosphate of metal M will be (a) MPO4 (b) M2PO4 (c) M3PO4 (d) M2(PO4)3 2. There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The proton is heavier than an electron by___________. Share practice link. An element has an electronic configuration of 2, 8, 7. The four atomic species can be represented as follows. Rutherfords scattering experiment is related the size of: Rutherfords discovery of the nucleus of an atom was based on the alpha scattering experiment. Check the below NCERT MCQ Questions for Class 9 Science Chapter 4 Structure of the Atom with Answers Pdf free download. Homework. Its valency is ? By Gurmeet Kaur Jan 13, 2020 15:44 IST. Develop your concepts accordingly and find out new scientific facts about an atom and its subatomic particles. 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Need assistance? myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important … Electronic configuration of chlorine is 2, 8, 7. It has 12 protons, 12 electrons and 13 neutrons. This contains 20 Multiple Choice Questions for Class 9 Structure Of Atom - Practice Test, Class 9 Science (mcq) to study with solutions a complete question bank. MCQs Test on Structure of Atom, Atomic Structure with answers, Test: 1, Total Questions: 15 The atomic symbol has three parts:-The symbol X: the usual element symbol; The atomic number A: equal to the number of protons ; The mass number Z: equal to the total number of protons and neutrons in an element. Test , Class 9, Chemistry, CBSE- Structure of Atom. 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