EVERYDAY SCIENCE

Detailed explanation-1: -First ionization energy is the energy that is required to remove the first electron from a neutral atom. It is numerically same as the orbital energy of the electron but of opposite sign.

Detailed explanation-2: -(Chemists typically use joules, while physicists use electron volts.) For a hydrogen atom, composed of an orbiting electron bound to a nucleus of one proton, an ionization energy of 2.18 × 10−18 joule (13.6 electron volts) is required to force the electron from its lowest energy level entirely out of the atom.

Detailed explanation-3: -By definition, the first ionization energy of an element is the energy needed to remove the outermost, or highest energy, electron from a neutral atom in the gas phase. The process by which the first ionization energy of hydrogen is measured would be represented by the following equation.

Detailed explanation-4: -Definition: First Ionization Energy The first ionization energy is the energy required to remove the most loosely held electron from one mole of neutral gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. This is more easily seen in symbol terms.

Detailed explanation-5: -An element’s second ionization energy is the energy required to remove the outermost, or least bound, electron from a 1+ ion of the element. Because positive charge binds electrons more strongly, the second ionization energy of an element is always higher than the first.