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| শ্ৰেণী | নৱম |
| বিষয় | বিজ্ঞান |
| অধ্যায় | 4 |
| পাঠৰ নাম | পৰমাণুৰ গঠন |
| মাধ্যম | অসমীয়া আৰু ইংৰাজী |
পৰমাণুৰ গঠন
প্ৰশ্নাৱলী–1 Page No 47
1. কেনেল ৰশ্মি কি?
উত্তৰঃ
2. পৰমাণু এটাত এটা প্ৰ'টন আৰু এটা ইলেকট্ৰ'ন থাকিলে ই কোনো আধান বহন কৰিবনে নকৰে?
উত্তৰঃ
প্ৰশ্নাৱলী–2 Page No 49
প্ৰশ্নাৱলী–3 Page No 49
1.
উত্তৰঃ পৰমাণুৰ তিনিটা উপ–পাৰমাণৱিক কণাৰ নাম হ'ল ইলেকট্ৰ'ন, প্ৰ'টন আৰু নিউট্ৰন।
2.
উত্তৰঃ
Exercises
1. Compare the properties of electrons, protons and neutrons.
2. What are the limitations of J.J. Thomson’s model of the atom?
3. What are the limitations of Rutherford’s model of the atom?
4. Describe Bohr’s model of the atom.
5. Compare all the proposed models of an atom given in this chapter.
6. Summarise the rules for writing of distribution of electrons in
various shells for the first eighteen elements.
7. Define valency by taking examples of silicon and oxygen.
8. Explain with examples (i) Atomic number, (ii) Mass number,
(iii) Isotopes and iv) Isobars. Give any two uses of isotopes.
9. Na+
has completely filled K and L shells. Explain.
10. 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.
11. The average atomic mass of a sample of an element X is 16.2 u.
What are the percentages of isotopes 16
8 X and 18
8 X in the
sample?
12. If Z = 3, what would be the valency of the element? Also, name
the element.
13. Composition of the nuclei of two atomic species X and Y are
given as under
X Y
Protons = 6 6
Neutrons = 6 8
Give the mass numbers of X and Y. What is the relation between
the two species?
14. 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.
(b) A neutron is formed by an electron and a proton
combining together. Therefore, it is neutral.
(c) The mass of an electron is about
1
2000 times that of proton.
(d) An isotope of iodine is used for making tincture iodine,
which is used as a medicine.
Put tick (ü) against correct choice and cross (×) against
wrong choice in questions 15, 16 and 17
15. Rutherford’s alpha-particle scattering experiment was
responsible for the discovery of
(a) Atomic Nucleus (b) Electron
(c) Proton (d) Neutron
16. Isotopes of an element have
(a) the same physical properties
(b) different chemical properties
(c) different number of neutrons
(d) different atomic numbers.
17. Number of valence electrons in Cl–
ion are:
(a) 16 (b) 8 (c) 17 (d) 18