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The Fundamental Unit of Life
Question
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Write the distribution of electrons in carbon and sodium atoms.

Answer

The total number of electrons in a carbon atom is 6. The distribution of electrons in carbon atom is given by: 
First orbit or K-shell = 2 electrons 
Second orbit or L-shell = 4 electrons 
or, we can write the distribution of electrons in a carbon atom as 2, 4. 
The total number of electrons in a sodium atom is 11. The distribution of electrons in sodium atom is given by: 
First orbit or K-shell = 2 electrons 
Second orbit or L-shell = 8 electrons 
Third orbit or M-shell = 1 electron 
or, we can write distribution of electrons in a sodium atom as 2, 8, and 1. 

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Some More Questions From The Fundamental Unit of Life Chapter

What are the limitations of J.J. Thomson’s model of atom?

What are the limitations of Rutherford model of the atom?

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.