XTreem Science Presents Everything An 8th Grade Student Needs to Know about the Atom - TEKS 8.5 (A) (B)

8.5 Matter and energy. The student knows that matter is composed of atoms and has chemical and physical properties. The student is expected to:_x000D_ _x000D_ (A) describe the structure of atoms, including the masses, electrical charges, and locations, of protons and neutrons in the nucleus and electrons in the electron cloud;_x000D_ _x000D_ (B) identify that protons determine an element's identity and valence electrons determine its chemical properties, including reactivity;