Atoms and Molecules

The smallest particle of matter is 

• an atom
• a molecule
• a nucleus
• a proton

The smallest, negatively charged subatomic particle is the 

• neutron 
• electron
• proton
• nucleus

The center of an atom is the 

• nucleus
• molecule
• electron
• proton

The subatomic particles found in the nucleus are 

• A. protons and electrons 
• B. only the neutrons 
• C. protons and neutrons
•  D. neutrons and electrons 

The Periodic Table 

• arranges chemical elements in order of atomic number 
• groups similar elements together in columns
• was designed by Dimitri Mendeleev
• all of these

Elements are

• two or more bonded atoms 
• the same as molecules
• particles inside the nucleus
• one type of atom 

The atomic number is the same as

• the number of protons
• the number of neutrons
• the atomic weight
• the protons plus the neutrons 

The chemical symbol for helium is

• H
• He
• Heli
• none of these

One example of a nonmetal is

• Sodium
• Radon
• Aluminum
• Oxygen

The mass of an element is determined by

• The number of electrons
• The number of neutrons
• The number of neutrons plus protons
• The atomic number