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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NGSS.HS-PS1-1

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Sodium (Na) is found in period 

• 3
• 2
• 4
• 1

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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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NGSS.HS-PS1-1

What does the C 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

What is the symbol for Potassium?

• P
• K
• Pb
• Pd

What is the symbol for Carbon?

• C
• Ca
• Cl
• H

Which one of these is not a noble gas?

• Helium
• Radon
• Iodine
• Krypton

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