periodic table

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.

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

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

Elements which are shiny, conduct electricity and heat are called

• metal
• nonmetal
• metalloid
• nonexistent

The atoms along the staircase are called 

• metals
• nonmetals
• metalloids
• noble gases

Tags

NGSS.MS-PS1-1

How many electrons does a Copper atom have?

• 63
• 29
• 92
• 34

Tags

NGSS.MS-PS1-1

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What does the 1.00794 stand for?

• Hydrogen
• atomic number
• atomic mass
• atomic explosion

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

In the modern periodic table elements are arranged by:

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