chemistry - structure of the atom

Class 9 - Chemistry

Structure of the Atom

MCQ
Q&A
Notes
Question:
Why is an atom neutral inspite of the presence of charged particles in it ?
Answer:

An atom is electrically neutral. This is because the number of protons and electrons in an atom is equal

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Questions and Answers


Structure of the Atom - Questions
1. Name the fundamental particle not present in the nucleus of hydrogen atom
Answer
2. What do you think would be the observation if the ?-particle scattering experiment is carried out using a foil of a metal other than gold?
Answer
3. Fill in the blanks :
The fundamental sub-atomic particle called neutron was discovered by ___________.
Answer
4. Fill in the blanks :
The total number of protons and neutrons in the nucleus of an atom is called its __________.
Answer
5. Fill in the blanks :
Co-60 a radio isotope is used in treatment of __________.
Answer
6. What are the properties of anode rays?
Answer
7. If an atom contains one electron and one proton, will it carry any charge or not?
Answer
8. Fill in the blanks :
In the three fundamental sub-atomic particles, _________ are negatively charged, _________ are positively charged and ____________ have no charges.
Answer
9. Fill in the blanks :
The maximum number of electrons that can be accommodated in L-shell are _______.
Answer
10. Fill in the blanks :
_________ are atoms of different elements which have same number of neutrons but different mass numbers.
Answer
11. Fill in the blanks :
Mass of a proton is __________ times the mass of an electron.
Answer
12. Who discovered X-Rays?
Answer
13. Write a short note on Nucleus.
Answer
14. Fill in the blanks :
Atoms are made up of __________, ___________ and __________.
Answer
15. Fill in the blanks :
Anode rays are also called ___________.
Answer
16. Fill in the blanks :
Rutherford's scattering experiment is related to to the size of ____________.
Answer
17. Fill in the blanks :
Atomic number is equal to _____________.
Answer
18. Fill in the blanks :
The mass number of an atom is equal to the number of ________ in its nucleus.
Answer
19. Fill in the blanks :
_______ are atoms having the same mass number but different atomic numbers.
Answer
20. Who discovered electrons?
Answer
21. What is ionization energy?
Answer
22. Fill in the blanks :
________ rays are negatively charged.
Answer
23. Fill in the blanks :
The _________ of an atom is dense, small in size and is positively charged.
Answer
24. Fill in the blanks :
Nucleons are __________ and ___________.
Answer
25. Fill in the blanks :
Valency is the __________ _____________ of an atom.
Answer
26. Fill in the blanks :
______ are atoms of the same element, which have same number of protons but different mass numbers.
Answer
27. Who discovered protons?
Answer
28. Who discovered nucleus of an atom?
Answer
29. What were the important features of atomic model based on Rutherford's scattering experiment?
Answer
30. Fill in the blanks :
__________ electrons are located in the outermost shell of an atom.
Answer
31. Fill in the blanks :
The maximum number of electrons that can be accommodated in K-shell are _______.
Answer
32. Who discovered neutrons?
Answer
33. Complete the following table.
ParticleElectronProtonNeutron
(i) Symbol__ __ __
(ii) Nature__ __ __
(iii) Relative Charge__ __ __
(iv) Absolute Charge__ __ __
(v) Relative Mass__ __ __
(vi) Absolute Mass__ __ __

Answer
34. What is the mass of proton as compared to electron?
Answer
35. What is Atomic Number? Who coined this term?
Answer
36. On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom?
Answer
37. What are the limitations of Rutherford’s model of the atom?
Answer
38. If A = 23 and Z = 11 for Na atom, how many protons, electrons and neutrons present in Na atom?
Answer
39. Fill in the blanks :
The fundamental particle not present in hydrogen atom is __________.
Answer
40. What are ?-particles?
Answer
41. What were the observations of Rutherford's ?-scattering experiment?
Answer
42. What are cathode rays?
Answer
43. Describe briefly Thomson's model of an atom.
Answer
44. What is mass number?
Answer
45. Fill in the blanks :
An atom has mass number 27 and atomic number 13. The atom has _________ electrons, _____ protons and _______ neutrons.
Answer
46. Describe Bohr’s model of the atom.
Answer
47. What are canal rays?
Answer
48.

Draw a sketch of Bohr’s model of an atom with three shells.


Answer
49. Write the limitations of J.J. Thomson's model of an atom.
Answer
50. Who is known as 'Father of Nucleus Physics'?
Answer
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