A certain element is a metalloid that forms an acidic oxide with the formula R_(2)O_(5). Identify the elements

A certain element is a metalloid that forms an acidic oxide with the f

1.	A certain element is a metalloid that forms an acidic oxide with the formula R_(2)O_(5). Identify the elements
Answer» Solution :Since the elements forms as axide with formula, `R_(2)O_(5)`, it must be an element of GROUP 15. Now group 1 has TWO metalloids, As and Sb. Since the acidic character of pentoxides of group 15 elements decrease while the basic character increases down the group, therefore, `As_(2)O_(5)` is acidic while `Sb_(2)O_(5)` is amphoteric. THUS, the metalloid of group 15 elements which forms an acidic pentoxide `(As_(2)O_(5))` is As.