8th Grade Unit 2 Vocabulary

smallest particle of an element that maintains the properties of that element

• atom
• atomic mass
• atomic number
• electrical charge

average mass of one atom of an element (from particles in the nucleus)

• atom
• atomic mass
• atomic number
• electrical charge

the number of protons in the nucleus of an atom; used to determine an element's position in the periodic table

• atom
• atomic mass
• atomic number
• electrical charge

a property of a subatomic particle; positive (protons), negative, (electrons), or neutral (neutrons)

• atom
• atomic mass
• atomic number
• electrical charge

a negatively charged particle in the electron cloud surrounding the atomic nucleus

• Electron
• Electron cloud
• Periodic Table
• Proton

the negatively charged space containing electrons that surrounds the atomic nucleus

• Electron
• Electron cloud
• Periodic Table
• Proton

a conceptual model in which the elements are organized according to their properties; often displayed as a chart

• Electron
• Electron cloud
• Periodic Table
• Proton

a positively charged particle within the atomic nucleus; used to identify an element

• Electron
• Electron cloud
• Periodic Table
• Proton

a (neutral) particle with no electrical charge within the atomic nucleus

• Neutron
• Nucleus
• Subatomic particle
• Valence electron(s)

the positively charged center of an atom containing the protons and neutrons

• Neutron
• Nucleus
• Subatomic particle
• Valence electron(s)