For a given element, the atomic number indicates the number of _____

• protons in the nucleus
• neutron in the nucleus
• electrons in the atom
• nucleons in the atom

For an atom, the number of electrons is equal to the number of _____

• protons
• protons plus neutrons
• neutrons
• nucleons

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

the central region of an atom where its neutrons and protons are is its 

• nucleus 
• electron cloud
• core 
• center 

Particles in an atom that are neutral and have no charge are 

• negatrons 
• electrons 
• neutrons 
• protons 

What number indicates the nucleus?

• 1
• 2
• 3
• 4

What number indicates an electron?

• 1
• 2
• 3
• 4

What is the mass number?

• the number of protons
• the sum of the number of protons and the number of neutrons in the nucleus of an atom 
• the number of electrons
• the number of neutrons

Where is most of the mass in an atom located?

• in the nucleus
• in the protons
• in the neutrons
• in the electrons

an atom with atomic number 6 would have how many protons 

• 6
• 12
• 3
• cannot be determined