I'm confused with these sizes. Radius of H is 30 picometers in the first picture. Google says 1 picometer = 0.01 angstroms. That means the radius of H is 0.3 angstroms. But in the second picture carbon and silicon ions are smaller than this. That doesn't make sense because H has one electron 1s1 but Si4+ is 1s2 2s2 2p6 so it must be bigger.
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