CHEMISTRY REV A

UP and DOWN columns on the periodic table are

• groups

• periods

Which elements have properties in common?

• elements in a group

• elements in a period

The group number tells you the number of

• protons

• valence electrons

• energy levels

How many protons does Lithium have?

• 3

• 4

• 7

How many electrons does Lithium have?

• 3

• 4

• 7

• Periods
• Groups

Which particles make up the nucleus of an atom?

• protons and neutrons

• electrons and protons

• electrons, protons, and neutrons

A positively charged particle found in the nucleus of the atom

• Proton
• Electron
• Neutron

The negative charge particles that float around the outside of the atom

• Proton
• Neutron
• Electron

What are valence electrons?

• electrons on the first shell

• nucleus

• the outermost shell

• the electrons on the outermost shell (energy level)