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Monday, March 4, 2013

Download HSEB Notes of Chemistry | Atomic Nuclei | Extra Reference | Ebook | Class 11

CHEMISTRY | EXTRA REFERENCE | EBOOK
DOWNLOAD HSEB NOTES ON ATOMIC NUCLEI | CHEMISTRY
CLASS : 11
File type : DOC
Size : 619 KB
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Amazingly  enough,  human  mind  that  is  kind  of  contained  inside  a  couple  of liters of human's brain, is able to deal with extremely large as well as extremely small  objects  such  as  the  whole  universe  and  its  smallest  building  blocks.   So, what  are  these  building  blocks?   As  we  already  know,  the  universe  consists  of galaxies,  which  consist  of  stars  with  planets  moving  around.   The  planets  are made  of  molecules,  which  are  bound  groups  (chemical  compounds)  of  atoms.   There  are  more  than 1020  stars  in  the  universe.   Currently,  scientists  know over  12  million  chemical  compounds  i.e.  12  million  diferent  molecules.  All  this variety of molecules is made of only a hundred of diferent atoms.  For those who believe  in  beauty  and  harmony  of  nature,  this  number  is  still  too  large.   They would  expect  to  have  just  few  diferent  things  from  which  all  other  substances are made.  In this chapter, we are going to find out what these elementary things are. 


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