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  3. The atomic number of an element 'X' is 20. Write 3 (a) its valency

. The atomic number of an element 'X' is 20. Write 3 (a) its valency

The atomic number of an element 'X' is 20. Write  3 (a) its valency

 

(b) whether it is a metal or non-metal,

 

(c) the formula of compound formed when the element 'X' reacts with an element 'Y' of atomic number 8. 

 

Justify your answer in each case

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The atomic number of an element 'X' is 20. Write 3 (a) its valency

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