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Structure of the Atom Exercises Solutions
- Q1: Compare the properties of electrons, protons and neutrons.
- Q2: What are the limitations of J.J. Thomson’s model of the atom?
- Q3: What are the limitations of Rutherford’s model of the atom?
- Q4: Describe Bohr’s model of the atom.
- Q5: Compare all the proposed models of an atom given in this chapter.
- Q6: Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.
- Q7: Define valency by taking examples of silicon and oxygen.
- Q8(i): Explain with examples (i) Atomic number. Give any two uses of isotopes.
- Q8(ii): Explain with examples (ii) Mass number. Give any two uses of isotopes.
- Q8(iii): Explain with examples (iii) Isotopes. Give any two uses of isotopes.
- Q8(iv): Explain with examples iv) Isobars. Give any two uses of isotopes.
- Q9: $Na^+$ has completely filled $K$ and $L$ shells. Explain.
- Q10: If bromine atom is available in the form of, say, two isotopes $^{79}_{35}Br$ (49.7%) and $^{81}_{35}Br$ (50.3%), calculate the average atomic mass of bromine atom.
- Q11: The average atomic mass of a sample of an element $X$ is 16.2 u. What are the percentages of isotopes $^{16}_8X$ and $^{18}_8X$ in the sample?
- Q12: If $Z = 3$, what would be the valency of the element? Also, name the element.
- Q13: Composition of the nuclei of two atomic species $X$ and $Y$ are given as under Give the mass numbers of $X$ and $Y$. What is the relation between the two species?
- Q14(a): For the following statements, write T for True and F for False. (a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons.
- Q14(b): For the following statements, write T for True and F for False. (b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.
- Q14(c): For the following statements, write T for True and F for False. (c) The mass of an electron is about $\frac{1}{2000}$ times that of proton.
- Q14(d): For the following statements, write T for True and F for False. (d) An isotope of iodine is used for making tincture iodine, which is used as a medicine.
- Q15: Rutherford’s alpha-particle scattering experiment was responsible for the discovery of
- Q16: Isotopes of an element have
- Q17: Number of valence electrons in $Cl^-$ ion are:
- Q18: Which one of the following is a correct electronic configuration of sodium?
- Q19: Complete the following table.
Chapters in CBSE - Class 9 Science
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