| समूह-$I$ के तत्व | $Li: 52\, pm, Na: 61\, pm, K: 231\, pm, Rb: 244\, pm, Cs: 262\, pm$ |
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| आवर्त $II$ के तत्व | $B$ | $Be$ | $O$ | $N$ | $Li$ | $C$ |
| परमाणु त्रिज्या $(pm)$ | $88$ | $111$ | $66$ | $74$ | $152$ | $77$ |
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