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a] Name the element with atomic number 1...

a] Name the element with atomic number 17.
  b]To which period does it belong?
c]To which group does it belong?
d]Write its electronic configuration. 

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(i) Chlorine
(ii) `3^(rd)` period
(iii) `17^(th)` group
(iv) 2, 8, 7.
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