Ionization energy is the minimum amount of energy required to remove an electron from a neutral atom in its gaseous state.
Imagine ionization energy as the force needed to pull off a band-aid. The stronger it's stuck on (the more tightly an electron is held by an atom), the more energy (force) you need to remove it (pull off).
First Ionization Energy: This refers specifically to the amount of energy required to remove one electron from each atom in one mole of atoms, creating 1+ ions.
Second Ionization Energy: This refers specifically to the amount of energy required to remove a second electron from each singly-charged positive ion in one mole of 1+ ions, creating 2+ ions.
Electronegativity: It's a measure that reflects how strongly an atom can attract a pair of bonding electrons towards itself.
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