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Complete the table given below and answer the following questions (symbols used are not true)

  Element  Atomic number  Electronic configuration
 P  9  2,7
 Q  17  .......
 R  10  ....... 
 S  12  ......

a) Which element in the table is the most stable one? Justify your answer. 

b) Which element donates electrons in chemical reaction? 

c) Write the chemical formula of the compound formed by

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  Element  Atomic number  Electronic configuration
 P  9  2,7
 Q  17  2,8,7
 R  10  2,8
 S  12  2,8,2

a) R – it contains an octet configuration in the outermost shell. 

b) S 

c) The valency of S = 2 and P is 1, hence the chemical formula 

[The element in which the electron lose can be written first]

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