This question may require the use of the Chemistry
Reference Tables or the Periodic
Table of Elements.|
Which sequence of Group 18 elements demonstrates a gradual decrease in the strength of the Van der Waals forces? All the choices are elements in the liquid state.
Ar, Kr, Ne, Xe
Kr, Xe, Ar, Ne
Ne, Ar, Kr, Xe
Xe, Kr, Ar, Ne
Correct Answer Number: 4
Explanation: Van der Waals forces are weak forces of attraction between molecules. These forces decrease as the molecule gets smaller and increase as the molecule increases. Look at the periodic table and notice how in answer 4, the elements are getting smaller. Therefore the Van der Waals forces would also be decreasing.