After the second level has 8 electrons, the next electron goes into the third level. 3rd Period: Sodium to argon—Electrons go into the third energy level. After the third energy level has 8 electrons, ...

The modern periodic table is based closely on the ideas he ... For example, lithium (Li), sodium (Na) and potassium (K) all have the same kind of reaction with water. The group of elements below ...

These are almost one-quarter of the periodic table and are mainly found in the ... chlorine, potassium, sodium, calcium and magnesium. How polio affects the body and what WHO is doing to eliminate ...

Sodium: A Brief Overview Sodium is an alkali metal, part of group 1 on the periodic table. It is known for its silvery appearance and softness, making it easy to cut. Sodium is highly reactive ...

The modern periodic table is based closely on the ideas he ... For example, lithium (Li), sodium (Na) and potassium (K) all have the same kind of reaction with water. The group of elements below ...