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(i) Name the element with atomic number 17.
(ii) To which period does it belong?
(iii) To which group does it belong?
(iv) Write its electronic configuration.
Answer
1. The element with atomic number 17 is Chlorine .
Electronic configuration of Chlorine: 2, 8, 7
2. Since there are 3 shells, it belongs to the third period .
3. Group number = 10 + Number of electrons in outermost shell = 10 + 7 = 17
4. Electronic configuration: 2, 8, 7
