Unit 2 Review

Arranged the periodic table according to atomic mass.

• Mendeleev

• Moseley

• Heisneberg

• Lavoisier

The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers

The Modern Periodic Table of Elements is arranged by

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

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Sodium (Na) is found in period 

• 3
• 2
• 4
• 1

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Sodium (Na) is found in group 

• 1
• 2
• 3
• 4

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The atomic number tells you what?  READ THE ANSWERS CAREFULLY

• only the number of electrons
•  only the number of protons
• only the number of neutrons
• the number of both electrons and protons in an atom.

What does the 6 represent?

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

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The horizontal (side to side) rows in the Periodic Table are called

• groups

• families

• periods

• atomic numbers

how many groups/families are on the table

• 15

• 16

• 17

• 18

what is the name of group number 1

• halogens

• noble gases

• alkali

• alkaline earth

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