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Electronic configuration of an atom of a...

Electronic configuration of an atom of an element is 2, 8, 18, 7.
a) What is the atomic number?
b) In which of the period and group this element is included in the periodic table?
c) Write the family name of this atom.

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a) 35
b) Period number - 4, Group number - 17
c) Halogens
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