an atom a belongs to 3rd a and b belongs to 7tha group the formula formed is
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Atomic number of A – 17 Electronic configuration of A = ( 2, 8,7) A is a non-metal. B --> 2,8,1 B will give one electron to A to form an ionic compound– Ionic bond Formula of the compound B+ A- Read more on Sarthaks.com - https://www.sarthaks.com/296543/an-element-a-belongs-to-3rd-period-and-17th-group-of-the-periodic-table
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AlCl3 is the formula..as 3rd group has 3 valency while 7th group has 1 valency
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