Group 3A element that forms the most basic oxide is Thallium (Tl) or element 113
What are basic oxides?
"Basic oxides" is a compound of the words "Basic" and "oxides". The word oxides referred to chemical compounds that have one or more oxygen combined with another element such as H2O or CO2. Based on their acid-base characteristics oxides can be classified into four categories: acidic oxides, basic oxides, and amphoteric oxides, and neutral oxides.
Alkali Metals (Group 1)X2O + H2O → 2XOH (X means group 1)
Alkaline Earth Metals (Group 2)XO + H2O → X(OH)2 (X means group 2)
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