Switch the property and the whole table re-shades with measured values. Pick an element to see its row and its column plotted, so you can watch the trend instead of memorizing it.
Every shaded cell carries a real measured number. Hatched cells have no reliable value for this property.
One step right adds a proton without adding a shell. One step down starts a whole new shell.
The nucleus pulls outward electrons in. Inner electrons block part of that pull. What is left over is the effective nuclear charge.
Each property asks the same question in a different way. How tightly does this atom hold electrons? The pull rises toward fluorine and drops toward cesium.