Which of the following is NOT a subatomic particle?

What is the smallest particle of an element that retains its properties?

The atomic number of an element is determined by the number of

The atomic symbol of silver is

The atomic symbol of Iron is

The mass number of atom is equal to total number of

All noble gas molecules are

What is the molecular weight of heavy water?

Protons have a positive charge, neutrons have a neutral charge, and electrons have a _____ charge.  

Molecules are groups of atoms that are ____ together.