How many electrons does a nikel have?

Answer 1

A nickel weighs 5 grams. It is 75% nickel and 25% copper. The atomic weight of nickel is 58.71 and the atomic weight of copper is 63.54.

So there is 0.0639 moles of nickel and 0.0197 moles of copper in a US nickel. There are

6.02 * 10^23 atoms in a mole (Avogadro's number).

There are 6.02 * 10^23 * 0.0639 = 3.48 * 10^22 atoms of nickel, and

6.02 * 10^23 * 0.0197 = 1.184 * 10^22 atoms of copper.

Since a nickel atom contains 28 electrons, and a copper atom contains 29 electrons, we have

9.744 * 10^23 electrons for the nickel component, and 3.433 * 10^23 electrons for the copper component.

Total is 1.317 * 10^24 electrons.