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Calculate total number of fundamental particles present in a molecule of heavy water

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In each deuterium atom `(D-=""_(1)H^(2))` , totally fundametal particles `(l"e"^(-),1p,1n)` are present.
In each oxygen atom `(""_(8)O^(16))`, 24 fundamental particles `(8^(-),8p,8n)` are present.
Total number of fundametal particles in a molecule of heavy water `(D_(2)O)=2xx3+24=30`.
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