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The Fundamental Unit Of Life
Question
Argon atoms has 18 electrons. How many energy shells or orbits are incomplete ? How many energy shell it contains?
Solution
Distribution of 18 electrons in argon atom is as follows:
K-shell = 2 electrons
L-shell = 8 electrons
M-shell = 8 electrons
K-shell and L-shell have maximum capacity of 2 and 8 electrons respectively. M-shell has a capacity of 18 electrons. Since, it is the outermost orbit and there is a rule that ‘the maximum number of electrons that can be accommodated in the outermost orbit is 8’. In the present case, M-shell is also complete. Thus, in argon atom, no shell is incomplete. Argon atom has three energy shells.
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Some More Questions From The Fundamental Unit of Life 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.
Rutherford’s α-particle scattering experiment was responsible for the discovery of
Isotope of an element has
Mock Test Series
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