Sodium is a metallic element on the periodic table with an atomic number of 11 and an atomic mass of 22.98 amu. This atomic mass is calculated by adding together the number of protons and neutrons present in the atom's nucleus. Sodium was discovered by Sir Humphrey Davy in 1807.
In addition to protons and neutrons, an atom consists of additional subatomic particles called electrons. Electrons orbit the nucleus in a cloud, but are so small when compared to protons and neutrons that their mass is not included in the calculation for atomic mass. Sodium's atomic nucleus contains 11 electrons.Learn More
An atom is the basic unit of a chemical element, and the two main regions of this structure are the nucleus and electrons. The nucleus is positively charged, while the electrons are negatively charged and orbit the nucleus.Full Answer >
Ethanol is highly polar. Each molecule has a hydroxyl group at one end, with oxygen bound to hydrogen, which is highly electronegative and enables the molecule to form strong hydrogen bonds with other polar molecules. The other end of the ethanol molecule, however, is non-polar.Full Answer >
Elements are classified as metals, nonmetals or metalloids. Noble gases are classified separately, although they are sometimes grouped with non-metals despite having different properties.Full Answer >
The columns on the periodic table of elements are called groups. The elements in a group share the same configuration of valence electrons, which gives the elements similar chemical properties. The number of valence electrons in a group is sometimes represented with a Roman numeral above the column.Full Answer >