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[Music] hi and welcome back to free science lessons by the end of this video you should be able to describe and explain the trend in first ionization energy across a period now weve already looked at ionization energy in the topic on atomic structure in this video were looking at ionization energy on the periodic table Im showing you the definition of first ionization energy here the first ionization energy is the energy needed to remove one mole of electrons from one mole of atoms in their gaseous state to form one mole of one positive ions also in their gaseous state Im showing you this homogenesium Im taking one mole of magnesium atoms in the gaseous state Im then removing one electron from each atom to form one mole of one positive magnesium ions also in their gaseous state the energy required to do this is the first ionization energy Im showing you here how the first ionization energy varies across period two Ive plotted the first ionization energy against the atomic numb