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[" 1.Three isotopes of an element have m...

[" 1.Three isotopes of an element have mass numbers,"M,(M+1)" and "],[(M+2)" .If the mean mass number is "(M+0.5)" then which of the following "],[" ratios may be accepted for "M,(M+1),(M+2)" in that order "],[[" (1) "1:1:1," (2) "4:1:1," (X3) "3:2:1," (4) "2:1:1]]

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