Answers

2015-02-26T17:45:22+05:30
Atomic no 17 is chlorine 
1--> valency +1 to +7 
2--> Group no. 17 (VIIA)
3--> 5 [Ne]3s2 3p5 as per electronic configration
4--> may be acidic 
5--> Cl2O, ClO2, Cl2O6, Cl2O7
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2015-02-26T17:51:35+05:30
ATOMIC NO 17 :- CHLORINE 

1. VALENCY:- 7

2.GROUP MEMBER OF :- 17

3.THE NUMBER OF ELECTRON IN IT'S VALENCE SHELL IS :- K,L,M 
K=2, L= 8, M= 7 SO VALENCE SHELL ELECTRON IS 7.

4.NATURE OF OXIDE:- CHLORINE DIOXIDE (CLO2)

5.FORMULA OF IT'S OXIDE IS :- CL2O3


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Sorry the valency will be 1.The charge will be -1.