23492u undergoes alpha decay. what is the atomic number of the resulting element. express your answer numerically as an integer.

Explanation:

It is known that an alpha particles is basically a helium nucleus and it contains 2 protons and 2 neutrons.  

Symbol of an alpha particle is or .

Therefore, when undergoes alpha decay then the reaction will be as follows.

Hence, the resulting element formed is thorium.

Therefore, we can conclude that atomic number of the resulting element is 90.