B. Cell, organ. Cells make tissue and tissue make organ.
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Answer : The correct answer is ⁶⁴ Zn ₃₀ .
Positron is ⁰e₊₁ particle . When it is absorbed the atomic number increases by 1 but atomic mass remains same . The given nuclide is ⁶⁴ Cu₂₉ . In this atomic mass is 64 and atomic number is 29 .
So when it will absorb one positron the atomic number will increase by 1 that is atomic number = 30 . Since atomic number = 30 is for Zinc atom , so when ⁶⁴ Cu₂₉ absorb one positron it produces ⁶⁴ Zn ₃₀ as resulting atom . The reaction can be written as:
⁶⁴ Cu₂₉ + ⁰e₊₁ → ⁶⁴ Zn ₃₀
Only NaCl has a polar bond as Na and Cl have got a big difference in electronegativity.