The+Arrangement+of+Electrons+in+Atoms.

The Arrangement of Electrons In Atoms  Atoms are arranged in the **periodic table** in order of their atomic number. The electrons in an atom are arranged in **energy levels** or **shells.** The number of electrons in the **outer shell** of an atom determines the way that the atom behaves in **chemical reactions**. The first **shell** of an atom has a **maximum** of two **electrons**, the second eight and the third eight also. 