The atoms of different elements have different numbers of protons, neutrons and electrons. Electrons are negatively charged; protons are positively charged and neutrons have no charge. Write a...

The atoms of different elements have different numbers of protons, neutrons and electrons. Electrons are negatively charged; protons are positively charged and neutrons have no charge.

1. Write a definition for an
   atom class
   that contains:
   
   
   
   1. Fields for storing the numbers of
      protons, neutrons and electrons
      with appropriate
      visibility;
   
   
   2. 
      Setter and getter
      methods for manipulating these fields, ensuring that the minimum value for
      electrons and protons is 1, and the minimum value for
      neutrons is 0;
   
   
   3. A
      constructor
      that initializes new objects of atom to be the smallest element (Hydrogen), for which the number of protons is 1, the number of neutrons is 0, and the number of electrons is 1.
   
   
   
   


2. Write a new method for the atom class called
   ision
   that will return
   true or false, depending upon whether the
   atom is an ion. An atom is an ion if it is charged (i.e., if the number of electrons ≠ the number of protons).


3. Write a new method for the atom class called
   getAtomicMassNumber
   that will calculate and
   return the atomic mass number
   of the atom. Atomic mass number of an atom (often denoted A) is defined as the number of protons plus the number of neutrons.)