How many protons and neutrons are in the nucleus of zinc-72

Why are the trends and exceptions to the trends in ionization energy observed?

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

When would a bouncy ball have the most potential energy