I get that the radius of atom increases as you go from left to rigt becaue incre

Question

I get that the radius of atom increases as you go from left to rigt becaue increase in protons causing e^- to be pulled in and i get that the radius increases as principal quantum incrases causing electron-electron repulsion. But it seems the oposite could also be true. As you go down a fam there is also an increase in protons to cause shrinkage and as you go from left to right you have more e^- causing electron-electon repulsion. Why does this not cancel out an increase in radius or cause it to be the inverse of how it really is?

Explanation / Answer

as we go down the group: at eac step a new shell starts where the valance electrons enter and each inner shell screens the outer shells. thus screen increases with increase in period number(as we go down the group). But along a period shells remain the same or similar screening.

inter as you go from left to right you have more e^- but electron-electon repulsion is minimized by spin pairing.

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