Multiple choice

What will be the formula of the sulphate of an element 'E' with atomic number 13?

  1. E2SO4

  2. E2(SO4)3

  3. E(SO4)2

  4. ESO4
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B Correct answer
Explanation

Element with atomic number 13 has electronic configuration 2, 8, 3. It tends to lose the 3 electrons present in its outermost shell. The sulphate ion carries two negative charges over it. So, three ions of E must combine with two ions of sulphate ion to make a neutral compound. So, the compound must have a formula E2(SO4)3.

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