Quantum Physics Of Atoms Molecules Solids Nuclei And Particles Solutions

Quantum Physics Of Atoms Molecules Solids Nuclei And Particles Solutions

The Quantum Physics Of Atoms Molecules Solids Nuclei And Particles Solutions are as below

01. ________ of an element are the atoms of that element which have the same atomic number but different atomic weights.

02. The phenomenon of spontaneous emission of radiation by heavy elements is called ________. The elements which show this phenomenon is called _________ Elements

03. ________ is reciprocal of time during which the number of atoms in the radioactive substance reduces to 36.8% of the original number of atoms in it.

05. The average time for which the nuclei of a radioactive sample exists is called __________ of that sample.04. The minimum energy supplied to an electron in order to free it from electrostatic force of attraction of nucleus is called ___________ of that electron.

06. _________ are the atoms of different elements which have same atomic weight, but different atomic numbers.

07. ________ is defined as the difference between the mass of the constituent nucleons of the nucleus in free state, and the mass of the nucleus.

08. The electrons revolves around the nucleus only in those orbits for which the angular momentum is equal to integral multiple of (h/2π). These orbits are called ___________________

09. The _________ of a nucleus may be defined as the energy required to break up a nucleus into constituent protons and neutrons and to separate them to such a large distance that they may not interact with each other.

10. _______ are the nuclides which contain the same number of neutrons i.e. in their case, (A-Z) = N is the same.

Quantum Physics Of Atoms Molecules Solids Nuclei And Particles Solutions

11. The phenomenon of splitting of a heavy nucleus (usually A > 230) into two or more lighter nuclei is called __________

12. Name the Postulate: In hydrogen atom, an electron revolves in a circular orbit about a nucleus. The centripetal force for the circular motion is provided by the electrostatic force of attraction between positively charged nucleus and the negatively charged electrons.

13. _________ suggested that matter (like electrons, protons, neutrons, etc) also have dual nature similar to light i.e. particle as well as wave nature.

14. In Geiger-Marsden Experiment, Rutherford’s Model of Atom, large angle scattering is due to mutual _________ between α-particles and nucleus

15. Find Odd one out with respect to nature of element: Isotopes, Isobars and Isotones

16. The Centripetal Force for revolving electrons, in an atom, is provided by __________

17. One of the drawbacks of Rutherford’s Model of Atom, is that, the revolving electrons falling to nucleus should radiate energy with continuously increasing frequency; we should observe ____________ spectra. But atom emit line spectra of well defined frequencies

18. If external energy of 13.6 eV or greater is given to H-atom, electron become free. This process is called ________

19. In a stable H-atom, electrons have minimum energy when it is in innermost orbit (n=1). It is called ground state. When energy is given to H-atom, then electron absorbs the energy and jumps to higher orbit. This is called _____ state (n=2,3,4,…)

20. de Broglie Hypothesis: Duality based on following assumptions:
(a) Whole energy of universe is in the form of electromagnetic radiations and matter
(b) Nature loves _______. So matter and energy must be symmetrical. If energy has dual nature, so matter should also have dual nature

Quantum Physics Of Atoms Molecules Solids Nuclei And Particles Solutions

21. A diagram showing the energy of electron in hydrogen atom in various orbits is known as ____________

22. The wave nature of matter was predicted by de-Broglie and confirmed experimentally by ________

23. Name the Postulate: The electrons can revolve without radiating energy in those orbits in which angular momentum of the electron is equal to an integral multiple of (h/2π), where h is Planck’s constant.

24. ________ are produced when high-velocity electron strike the target material of high atomic number

25. Find Odd one out with respect to Number of Neutrons in the nucleus: Isotopes, Isobars and Isotones

26. For which of the three – Isotopes, Isobars and Isotones, the Chemical Properties are identical?

27. For which of the three – Isotopes, Isobars and Isotones, the number of protons are same?

28. For which of the three – Isotopes, Isobars and Isotones, the number of nucleons are same?

29. ____ is equivalent to Helium nuclei.

30. Name the Postulate: An electron radiates energy when it jumps from outer stationary orbit of higher energy to inner stationary orbit of lower energy. This radiated energy is equal to the difference between energies of electrons in two orbits. This energy is radiated in the form of photon of energy (hγ)

Answers: Quantum Physics Of Atoms Molecules Solids Nuclei And Particles Solutions

01. Isotopes
02. Radioactivity, Radioactive
03. Radioactive Decay Constant
04. Binding Energy
05. Mean-Life or Average Life
06. Isobars
07. Mass-Defect
08. Bohr’s Orbits or Stationary Orbits or Quantized Orbits
09. binding energy
10. Isotones
11. Nuclear Fission
12. Bohr’s First Postulate (Postulate of circular orbit of the electron)
13. Louis de Broglie
14. repulsion
15. Isotopes {Isotopes are same elements; Isobars and Isotones are different elements }
16. Electrostatic force of attraction
17. continuous
18. Ionization
19. excited
20. symmetry
21. Energy-Level Diagram
22. Davisson and Germer
23. Bohr’s Second Postulate (Postulate of Selected Orbit)
24. X-rays
25. Isotones {Isotones have same Number of Neutrons; Isotopes and Isobars have different number of neutrons }
26. Isotopes have identical Chemical Properties
27. Isotopes
28. Isobars
29. α-particle.
30. Bohr’s Third Postulate (Postulate of the origin of spectral lines)

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