. An element X (atomic number 17) reacts with an element Y (atomic number 20) to a compound


(a) Write the position of these elements in the modern periodic table.

(b) Write the formula of the compound formed. Justify your answer  in each case.

Justify your answer in each case.

 

Best Answer

Ans.    Element ‘X’    Electronic configuration 2, 8, 7

Atomic number= 17

Element ‘Y’

Atomic number = 20           2, 8, 8, 2

• Element 'X' has seven electrons in its outermost shell therefore it belongs to 17th group.

• Element 'X' has 3 shells (energy) thus it belongs  to 3rd period.

• Element 'Y' has 2 electrons in its outermost shell therefore it belongs to 2nd group.

• Element 'Y' has 4 energy shells thus it belongs to 4th period.

(b) Valency of element 'X' is 1and it is a non-metal whereas the valency of element 'Y' is and it is a metal. Thus the bond between Y and X is ionic an formula is given by

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