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

###### FREE Expert Solution

a. All the copper atoms have 29 protons in the nucleus.

atomic number = # protons = 29

true

b. The number of electrons in the copper atoms is independent of atomic mass.

in a neutral atom = # proton = # electron

true

c. Copper is a mixture of at least two isotopes.

copper → have two isotopes

true

###### Problem Details

The atomic weight of copper, Cu, is listed as 63.546. Which of the following statements are untrue:

Check all that apply.

a. All the copper atoms have 29 protons in the nucleus.

b. The number of electrons in the copper atoms is independent of atomic mass.

c. Copper is a mixture of at least two isotopes.

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

e. The dominant isotopes of Cu must be 63Cu and 64Cu.