Free Practice 1

Name this group: These metals are the most reactive.

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What element is circled?

• Halogen

• Helium

• Hydrogen

• Hallium

• energy levels
• valence electrons
• protons
• neutrons

• Same group
• Same period

• Group 1
• Group 17
• Group 2
• Group 18

The Modern Periodic Table of Elements is arranged by

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Sodium (Na) is found in period 

• 3
• 2
• 4
• 1

What does the atomic mass tell you? 

• Basically,the number of electrons and protons
• The number of neutrons
• Basically, the number of protons and neutrons
• The number of protons.

What does the 6 represent?

• atomic mass
• atomic number
• element name
• chemical symbol 

What does 12.011 represent?

• atomic mass
• atomic number
• element name
• chemical symbol