The Heaviest elements have the smallest radii because as protons increase it brings the shells tighter.
Electronegativity decreases as you move down a group because there are more shells and the electrons are further away from the nucleus so it weakens the attraction.
It's easier to strip an electron from a non metal than from a metal because non metals like to gain electrons and metals like to lose electrons so it make sense that it would be harder to strip an electron from a non metal than a metal.
I think these trends are referred to as periodic because they are ongoing
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