From the new Science TEKS year at a glance Units 1-12 these proficiency scales lay out the approaches, meets, and mastery goals for each unit. Each unit covers 2 TEKS including specifications for error allotment for example: "There are no major errors or omissions regarding the simpler details and processes as the student:Recognizes or recalls specific terminology, such as:element, compound, atom, molecule, symbol/formula, pure substance, mixture, proportion/ratio, subscript, proton, neutron, el