Hydrogen can have an infinite number of energy levels, based on the principle of quantum mechanics. These energy levels are represented by the quantum number "n". More » Science Chemistry

The ionization energy for hydrogen is 1312 kilojoules per mole. This is the same as the ionization potential and is the energy required to remove one electron from the atom. While other elements have more than one ioniza... More » Science Chemistry Atoms & Molecules

For hydrogen, an electron jump from the second energy level down to the first emits a photon within the ultraviolet range of the spectrum at a wavelength of 1.21 x 10-7 meters, or 121 nanometers. The emitted photon has e... More » Science Physics Particle Physics
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The angular momentum quantum number is a number that specifies the shape of an orbital with a principal quantum number. The secondary quantum number divides shells into subshells, or smaller groups of orbitals. More » Science Chemistry

The alkaline earth metals are a group of elements on the periodic table that contain two electrons in their outermost energy levels and exhibit similar characteristics such as high reactivity. This group of elements cons... More » Science Chemistry

The octet rule states that atoms tend to form compounds because they need eight electrons in their outermost energy levels to achieve stability. These electrons in the outermost energy levels are called valence electrons... More » Science Chemistry

The main energy levels of an atom are indicated by the principal quantum numbers. This number, which illustrates the orbital size, describes the orbital energy of an atom indirectly. More » Science Chemistry