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Question

Complete the table given below by identifying P, Q, R and S.

ElementSymbolNo. ofNo. ofNo. ofProtonsNeutronsElectronsSodum 2311Na11P11Chlorine3517ClQ1817UraniumR9214692S 199F9109

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Solution

P 12
Q 17
R straight U presubscript 92 presuperscript 238
S Flourine

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