Ch. 6 Bio

Center of an atom made up of protons and neutrons

• Electron
• Proton
• Neutron
• Nucleus

Vertical columns on the periodic table are   called

• Elements
• Groups
• Periods
• Atoms

Negatively charged particles

• Atom
• Proton
• Neutron
• Electron

The building blocks of matter

• Protons
• Elements
• Atoms
• Groups

A pure substance that cannot be broken down into other substances by physical or chemical change

• Atoms
• Elements
• Neutrons
• Protons

Particles that have no charge

• Protons
• Neutrons
• Electrons
• Necleus

Horizontal rows on the periodic table are   called

• Groups
• Periods
• Atoms
• Elements

Positively charged particles

• Protons
• Neutrons
• Electrons
• Nucleus

About how many elements are on the periodic table

• 50-60
• 60-70
• 88-90
• Over 100

How many of the elements on the Periodic Table occur naturally

• 76
• 83
• 92
• 105