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Group and period number of two elements are given.

P – group 17, period – 3 

Q – group 2, period – 3 

a. Write the sub-shell electronic configuration of each. 

b Write the chemical formula of the compound formed by their combination.

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a. P -1s2 , 2s2 , 2p6 , 3s2 , 3p5

Q -1s2 , 2s2 , 2p6 , 3s2 

b. Q is electropositive. P is electro negative; 

∴Chemical formula QP2

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