Atomic Structure Key terms

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Subatomic particles with a positive charge

• neutrons
• atomic mass
• protons
• isotopes

Measure mainly of the nuclear particles: protons + neutrons

• Subatomic Particles
• Atomic Number
• Atomic Mass
• Gluons

Subatomic particles that are neutral in charge

• Neutrons
• Protons
• Nucleus 
• Electrons

Atoms of the same element with a different number of neutrons

• Ion

• alloy

• Isotope

• Quarks

A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass

• Electron Shells
• Orbitals
• Electron Cloud
• Nucleus

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

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

• electrons
• neutrons
• isotopes
• protons

The _________ of an element equals the number of protons in an atom of that element

• mass number
• atomic weight
• atomic number
• isotopes