The model of the atom changed as new evidence was discovered. The plum pudding model suggested that the atom was a ball of positive charge with
electrons embedded in it.
Evidence from the alpha particle scattering experiment led to a change in the model of
the atom from the plum pudding model.
Explain how.

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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not clear

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally