Class 8 science chapter 5 Inside the Atom excercisesQuestion answer swadhyay

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Class-8-Science-Chapter-5- Inside the Atom • Question 1: • Answer the following • A. What is the difference in the atomic models of Thomson and Rutherford ? • B. What is meant by valency of an element? What is the relationship between the number of valence electron and valency ? • C. What is meant by atomic mass number ? Explain how the atomic number and mass number of carbon are 6 and 12 respectively. • D. what is meant by subatomic particle ? give brief information of three subatomic particles with reference to electrical charge, mass and location • Question 2: • Give secientific reasons. • A. All the mass of an atom is concentrated in the nucleus. • B. Atom is electrically neutral. • C. Atomic mass number is a whole number. • D. Atoms are stable though negatively charged electron are revolving within it. • Question 3: • Define the following forms • A. Atom • B. Isotope • C. Atomic number • D. Atomic mass number • E. Moderator in nuclear reactor Answer: • Question 4: • Draw a neat lablled diagram • A. Ruthrford's scattering experiment • B. Thomson's atomic model • C. Diagramatic sketch of electronic configurations of magnesium (Atomic number 12) • D. Diagramatic sketeh of electronic configuration of Argon (Atomic number 18) • Question 5: • Fill in the blanks. • A. Electron, proton, neutron are the types of in an atom. • B. An electron carries a charge. • C. The electron shell is nearest to the nucleus. • D. The electronic configuration magnesium is 2, 8, 2. From this it is understood that the valence shell of magnesium is • E. The valency of hydrogen is 'one as per the molecular formula H2O . Therefore valency of 'Fe' turns out to be as per the formula Fe2O3. • Question 6: • Match the pairs. • Group 'A' Group 'B' • a. Proton 1. Negatively charged • b.Electron 2.Neutral • c.Neutron 3.Positively charged • Question 7: • Deduced from the datum 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