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First you have to find out the number of moles of Nickel in 0.63g. Do this by dividing 0.63 by the molecular weight of Nickel; 58.69g.

0.63/58.69= 0.01 mol (2 d.p.)

In one mole there are 6.02x1023 atoms. Therefore in 0.01 moles of Nickel there will be:

0.01 x 6.02x1023 = 9.15x1015 atoms.

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