The atomic weight of copper, CuCu, is listed as 63.546. Which of the following statements are untrue:Check all that apply.
All the copper atoms have 29 protons in the nucleus.
The number of electrons in the copper atoms is independent of atomic mass.
Copper is a mixture of at least two isotopes.
Not all neutral atoms of copper have the same number of electrons.
The dominant isotopes of CuCu must be 63Cu63Cu and 64Cu64Cu.

Not all neutral atoms of copper have the same number of electrons.

Explanation:

All neutral atoms of copper must have the same number of electrons. The number of electrons only differ in ions of copper. These ions are not neutral atoms of copper. Neutral copper atoms do not have a charge so the the number. The number of electrons in a neutral atom is the same as the number of protons which is a constant. This constant is known as the atomic number.

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