using protons to identify atoms

The total number of protons and neutrons in an atom is called the...

• proton number
• atomic number
• mass number
• weight number

What does the atomic number of an element represent?

• number of protons in an atom
• number of neutrons in an atom
• mass of an atom
• charge of an atom

How many protons does an Aluminum atom have? (use the picture to help you)

• 27
• 13
• 14
• 40

What determines the charge of an atom?

• the atomic mass of the atom
• the number of protons and electrons
• the number of neutrons and protons
• the number of energy levels in the electron cloud

The nucleus of an atom contains 12 protons and 13 neutrons. If the atom is electrically neutral, how many electrons does this atom have?

• 13
• 12
• 14
• 20

What characteristic of an element's atoms ALWAYS determines the element's identity?

• the number of neutrons
• the number of protons
• the atomic mass
• the number of valence electrons

How many neutrons does a sodium atom have? 

• 23
• 11
• 12
• 34

Atoms are broken into smaller pieces called what?

• Subatomic Particles

• Subatomic Pieces

• Quantum Particles

• Atomic Pieces

When a substance is made of the same type of atom it is called __________.

• a molecule

• a material

• an element

• a particle

To find how many neutrons are in an atom you subtract the Atomic Number from the rounded Atomic Mass.

• True

• False