This week we learned about periodic trends. There are four trends found on the periodic table, trends in atomic size, trends in ionization energy, trends in electron affinity, and trends in electronegativity.
For atomic size the trend is that as you move down a group the atoms tend to get larger. It is also noticed that as you move across the periodic table from left to right, the atomic size decreases. The trend for ionization energy is that it increases as you move up and to the right. For electron affinity and electronegativity the trend is also that it increases as you move up and to the right.
Therefore the element Cs has the largest atom, He has one of the highest ionization energies, and the most electronegative element is F because Noble gases do not normally combine with other elements so electronegativity is not a valid term for these elements.
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