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From the following find out groups of is...

From the following find out groups of isotopes, isobars and isotons.
`._(8)^(16)O,_(19)^(39)K,._(6)^(14)C,._(92)^(239)U,._(7)^(14)N,._(20)^(40)Ca,._(92)^(238)U,._(32)^(77)Ge,._(33)^(77)As,._(8)^(18)O,._(32)^(76)Ge,._(34)^(78)Se`.

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The correct Answer is:
Isotopes-same at . No. but different at. Masses.
`._(8)^(16)O,._(8)^(18)O;._(92)^(239)U,._(92)^(238)U;._(32)^(77)Ge,._(32)^(76)Ge`
Isobars-same atomic masses but different at. Numbers.
`._(6)^(14)C,._(7)^(14)N,_(32)^(77)Ge,._(33)^(77)As`
Isotones-same number of neutrons
`._(8)^(16)O,._(6)^(14)C;._(19)^(39)K,._(20)^(40)Ca;._(33)^(77)As,._(34)^(78)Se`.
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