What is true about all uranium atoms

All Uranium atoms will have the same number of protons.

If you change the number of protons in an element, you are esentially changing the element to a different one. This means that all atoms of the same element will have the same number of protons.

Also note that Uranium has different isotopes like U-235 and U-237. An isotope is defined as having the same number of protons (and electrons), but different numbers of neutrons. However, even an istope of Uranium will have the same number of protons.

passing a magnet thought the

mixture , because iron gets attracted to magnet .

that's what i got you can count the number of atoms