For two ions that have almost exactly the same radius (sodium and calcium), how can voltage-gated ion channels be selectively permeable to one or the other?

Name: For two ions that have almost exactly the same radius (sodium and calcium), how can voltage-gated ion channels be selectively permeable to one or the other?
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The Answer of For two ions that have almost exactly the same radius (sodium and calcium), how can voltage-gated ion channels be selectively permeable to one or the other?

For Two Ions That Have Almost Exactly the Same Radius