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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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a] Chlorine (CI).
b] Since it has 3 electron shells, it belongs to the 3rd period.
c] Since it has 7 valence electrons, it belongs to the 17th group.
d] Its electronic configuration is 2, 8, 7.
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ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (SHORT ANSWER (SA) TYPE QUESTIONS)
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