lesson 1 andd 2

In the periodic table elements are arranged by

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

Each row in the periodic table is called a 

• group
• period
• cluster
• unit

Each column in the periodic table is called a 

• period
• group/family
• cluster
• unit

A negatively charged particle that moves around the nucleus is a(n)

• proton
• neutron
• electron
• quark

Elements which are shiny, conduct electricity and conduct heat are called

• metals
• nonmetals
• metalloids
• ions

What does the 1.00794 stand for?

• Hydrogen
• atomic number
• atomic mass
• atomic explosion

The blue elements are called 

• metals
• nonmetals
• metalloids
• noble gases

An isotope is the same element with a different number of...?

• Protons

• Neutrons

• Electrons

How many valence electrons does sodium have?

• 1
• 2
• 3
• 4

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18