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The Fundamental Unit Of Life
Question
Explain the conduction of electricity through gases at very low pressures.
Solution
When we apply high electric voltage, the electric energy splits the gasesous molecules into positively charged particles and negatively charged particles. The negatively charged particles form cathode rays and positively charged particles form anode rays. These charged particles can conduct electric current through the discharge tube. However, if the gas in the discharge tube is at the atmospheric pressure, the large number of gas atoms collide with the electrons and prevent them from reaching the anode. In such circumstances no current flows through the discharge tube. When the gas pressure is very low, there are a few gas atoms in the discharge tube. In this situation the movement of electrons towards the anode is not hindered and thus the gas conducts electricity.
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Some More Questions From The Fundamental Unit of Life Chapter
Describe Bohr's model of the atom ?
Compare all the proposed models of an atom given in this chapter.
Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements.
Define valency by taking examples of silicon and oxygen.
Explain with examples, (i) Atomic number, (ii) Mass number, (iii) Isotopes, and (iv) Isobars. Give any two uses of isotopes also.
Na+ has completely filled K and L-shells. Explain.
If Z = 3, what would be the valency of the element? Also, name the element.
Composition of the nuclei of two atomic species X and Y are given as under
X Y
Protons = 6 6
Neutrons= 6 6
Give the mass numbers of X and Y. What is the relation between the two species?
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.
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