Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states. This is due to (a) Lanthanoid contraction Aluminium is usually found in +3 oxidation state. In contrast thallium exists in +1 and +3 oxidation states. This is due to (a) Lanthanoid contraction November 28, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) , Facebook Messenger WhatsApp Share this:TwitterFacebook Related