Periodic Trends

Atomic Radius:define
Size of an atom, from the nucleus to outermost stable electron.
Atomic Radius:Across
Decreases as you go across, because the pull from the protons pulls in the electrons closer making it smaller.
Atomic Radius:Down
Increases, because you add more electron orbits so it is obviously getting bigger.
Ionization Energy:Define
The Energy required to remove an electron from an atom
Ionization Energy:Across
Increases as you go across, because obviously it’s harder to take away for example 10 electrons than just remove 1.
Ionization Energy:Down
Decreases, because it’s farther away from the nucleus anyways so it’s easier.
Electronegativity:Define
Tendancy and ability of an atom to attract other electrons to share.
Electronegativity:Across+Down
Flourine is the most electronegative element so think of it as everything going to that one. It would increase as going across and then increase going up to flourine.
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