Amount of matter

• Weight
• Mass
• Volume
• Density

Color, smell, taste, texture, density

• Chemical properties
• Intensive properties
• Physical properties
• Extensive properties

Center of an atom

• nucleus
• cloud
• shells
• energy levels

Positively charged particle 

• Electron
• Neutron
• Proton
• Isotope

Which particle(s) is/are found in the nucleus?

• electron, neutron
• only electrons
• only protons
• proton, neutron

Which particle(s) move around the nucleus of an atom?  

• protons
• neutrons
• electrons
• protons, neutrons

Negatively charged particle in an atom

• electron
• neutron
• isotope
• proton

Has no charge

• proton
• neutron
• isotope
• electron

The number of protons an atom has

• isotope number
• mass number
• atomic mass
• atomic number

Where most of the mass is found in an atom

• Electron cloud
• Energy levels
• Nucleus
• Electron shells