Isotopes

Two atoms that are different isotopes of the same element have

• the same number of protons and the same number of neutrons

• the same number of protons but a different number of neutrons

• a different number of protons but the same number of neutrons

• a different number of protons and a different number of neutrons

Which notations represent atoms that have the same number of protons but a different number of neutrons?

• H-3 and He-3

• S-32 and S-32

• Cl-35 and Cl-37

• Ga-70 and Ge-73

The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the same number of protons per atom and

• the same number of electrons per atom

• the same number of neutrons per atom

• a different number of electrons per atom

• a different number of neutrons per atom

The stability of an isotope is related to its ratio of

• neutrons to positrons

• neutrons to protons

• electron to positrons

• electron to protons

If two atoms are isotopes of the same element, the atoms must have

• the same number of protons and the same number of neutrons

• the same number of protons and a different number of neutrons

• a different number of protons and the same number of neutrons

• a different number of protons and a different number of neutrons

The nuclides I-131 and I-133 are classified as

• isomers of the same element

• isomers of Xe-131 and Cs-133

• isotopes of the same element

• isotopes of Xe-131 and Cs-133

Which two atoms represent isotopes of the same element.

• A and D

• A and G

• E and D

• E and G

An atom that has 13 protons and 15 neutrons in an isotope of the element

• Nickel

• silicon

• Aluminum

• Phosphorus

The table below shows the number of subatomic particles in atom of X and in atom Z. Atom X and atom Z are isotopes of the element

• Aluminum

• Carbon

• Magnesium

• Nitrogen

The total number of protons, electrons, and neutrons in each of four different atoms are shown in the table below. Which two atoms are isotopes of the same element?

• A and D

• A and Z

• X and D

• X and Z