Which produces barium-137 when it undergoes gamma decay? a. cesium-137 b. cesium-138 c. barium-137 d. barium-138

C. Barium-137

We have barium-137

We need to know that when a radioisotope undergoes gamma decay its mass number and the atomic number remains unchanged.

In this case,

Therefore the correct choice is C. Barium-137

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.