Homework 9: Periodic Table Intro

The Modern Periodic Table of Elements is arranged by

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

Which group of the periodic table is composed of inert (not reactive)  gases?

• alkali metals
• alkaline earth metals
• halogens
• noble gases

Which is an alkali metal?

• Magnesium
• Iron
• Sodium
• Europium

Which is a halogen?

• Helium
• Chlorine
• Oxygen
• Neptune

Elements in a ..................have similar chemical properties.  

• period
• group
• row

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.

Beryllium is in group number______.

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

The horizontal row on the periodic table is called a

• group
• family
• period
• atomic number

Which element is found in period 3 group 2?

• Sodium (Na)
• Magnesium (Mg)
• Yttrium (Y)
• Boron (B)