Our solar system formed from a
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You want to convert mass to moles and then moles to particles/atoms:
69.7gNi x 1mol/58.7gNi x 6.022•10^23/1 mol = 7.15 x 10^23
69.7gNi x 1mol/58.7gNi x 6.022•10^23/1 mol = 7.15 x 10^23