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

In kilograms, the mass of a hydrogen atom is 1.67 times 10 to the power of negative 27 or 1.67 x 10-24 grams. That conversion is based on one atomic measurement unit of atomic mass for an atom of hydrogen. More » Science Chemistry

The hydrogen emission spectrum is a series of colors emitted when a hydrogen atom is excited by a high voltage. These colors are created by hydrogen's electron gaining or losing energy and moving to different energy leve... More » Science Chemistry Atoms & Molecules
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The ionization energy of an element is the amount of energy needed to rip an electron from an atom in the gaseous state. The ionization energy increases going up and to the right of the periodic table. More » Science Chemistry Atoms & Molecules

Second ionization energy is the energy needed to remove a second electron from an atom after one has already been removed. It always takes energy to remove electrons from atoms, although the amount of energy varies great... More » Science Chemistry Atoms & Molecules

The first ionization energy generally decreases down a group due to the increasing distance of the valence electrons from the nucleus of an atom. The increasing gap lowers the attractive force of the protons that pull th... More » Science Chemistry Atoms & Molecules

Potassium is the element that has a first ionization energy of 418 kilojoules per mol. The first ionization energy refers to the amount of energy required to remove 1 electron from 1 mol of gaseous atoms. More » Science Chemistry Atoms & Molecules