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

The atomic number tells you what?

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

Calcium's (Ca) properties are like which of the following?

• Barium
• Potassium
• Cesium
• Nitrogen

Beryllium (Be) is in group number______.

• Group 2
• Group 3
• Group 4
• Group 7

The period for Bromine (Br) is ___________.

• 3
• 2
• 4

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 horizontal row on the periodic table is called a

• group
• family
• period
• atomic number

Which element is found in group 16 period 3?

• Sulfur (S)
• Selenium (Se)
• Chlorine (Cl)
• Carbon (C)