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Look at the Bohr model of X-atom.

a. Write the sub-shell electronic configuration of this atom. 

b. Mention the compounds in which dsubshell electrons are taking part in chemical reaction during their formation. XCl2 , XO2 , X2O7 

c. Write the electronic configuration of X ions in the above three compounds.

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a. 1s2 , 2s2 , 2p6 , 3s2 , 3p6 , 3d5 , 4s2 

b. XCl2 – ion X2+(electrons in 4s only) 

XO2 – ion X+4 (2 electrons in 4s and 2 electrons in 3d) 

X2 O7 – ion X7+ (2 electrons in 4s and 5 electrons in 3d) 

XO2 , X2 O7 d – subshell electrons are taking part in chemical reaction during the formation of X207 

c. X2+ – 1s2 , 2s2 , 2p6 , 3s2 , 3p6 , 3d5 

X4+ – 1s2 , 2s2 , 2p6 , 3s2 , 3p6 , 3d3 

X – 1s2 , 2s2 , 2p6 , 3s2 , 3p6

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