Nickel-63 decays by β − emission to copper-63. write the complete decay formula for this process.

Ni has atomic number as 28.

After β⁻ decay, the daughter nucleus will have atomic number as 28 + 1 = 29 which belongs to copper.

Decay formula is,

₂₈⁶³Ni → ₂₉⁶³Cu+ ₋₁⁰β 

i am going to put the answers in order i dint feel like typing it out so yeah

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nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.