General Chemistry 10th Edition

Published by Cengage Learning
ISBN 10: 1-28505-137-8
ISBN 13: 978-1-28505-137-6

Chapter 8 - Electron Configurations and Periodicity - Questions and Problems - Page 330: 8.38

Answer

Please see the work below.

Work Step by Step

We know that the oxides of groups IIIA and VA form oxides of type $R_2O_3$. But group VA oxides can also be of the form $R_2O_5$, hence the required element is group IIIA, It forms boron oxide $B_2O_3$.
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