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_{92}^{238} U,_{92}^{235} U, a n d_{92}^{234} U

_{18}^{40} A r,_{19}^{40} K, a n d_{20}^{40} C a

_{6}^{14} C,_{7}^{15} N, a n d_{8}^{16} O

_{10}^{20} N c,_{10}^{21} N e, a n d_{10}^{22} N e

ANS : 3

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