Periodic table

In the modern periodic table elements are arranged by:

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

Each column in the periodic table is called a 

• period
• group
• cluster
• unit

Which element is found in group 2 period 4?

• Strontium (Sr)
• Barium (Ba)
• Calcium (Ca)
• Beryllium (Be)

Which element is found in group 6 period 5?

• Chromium (Cr)
• Tungsten (W)
• Molybdenum (Mo)
• Tantalum (Ta)

Which element is found in group 18 period 1?

• Neon (Ne)
• Helium (He)
• Chlorine (Cl)
• Krypton (Kr)

Which element is found in group 2 period 7?

• Radium (Ra) 
• Radon (Rn)
• Stontium (Sr)
• Lutetium (Lu)

What is the chemical symbol for Lithium?

• H
• He
• Li
• N

The number at the bottom of each square on the periodic table is the ...

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

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

• groups

• towers

• periods

• atomic numbers

Sodium (Na) is found in group 

• 1
• 2
• 3
• 4