Atomic Concepts

What is atomic number?

• Number of protons in an atoms 
• Number of neutrons in an atom
• Mass of an atom
• Charge on an atom

Which subatomic particles are found in the nucleus of an atom?

• Protons and Electrons
• Protons and Neutrons
• Neutrons and Electrons
• Protons, Neutrons and Electrons

What electrical charge does a proton have?

• +1
• 0
• -1
• +2

What mass does a neutron have?

• 1
• 0
• -1
• +2

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

• Atomic number
• Proton number
• Mass number
• Weight number

How many protons does an aluminium atom have? (Use the image to help you)

• 27
• 14
• 40
• 13

How many neutrons does a sodium atom have? (Use the image to help you)

• 23
• 11
• 12
• 34

All elements are composed of 

• molecules
• atoms
• neutrons
• compounds

____________ can move from one energy level to another when they gain or lose energy.

• electrons
• protons
• neutrons
• atoms

Atoms of the same element must always have the same number of _________

• electrons
• neutrons
• isotopes
• protons