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Q.

What is the formula of the sulphate of the element with atomic number 13?

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Detailed Solution

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The element with atomic number 13 is aluminium (Al) in the modern periodic table. 
Electronic configuration of Al = 2, 8, 3
Valency of Al = 3
Al can lose 3 electrons to form Al3+ and the sulphate ion has a charge of -2. So, 2 atoms of Al are required to bond with 3 sulphate ions to form a stable compound. 
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Hence, Al2(SO4)3 is the formula of the sulphate of the element with atomic number 13.

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