End of Year Review

What is the name for the central area of an atom, where most of the atom's mass is located?

• Neutron

• Electron

• Proton

• Nucleus

How many electrons does potassium K contain? 

• 19
• 39
• 20
• 40

What are valence electrons?

• electrons in the second orbit/energy level

• electrons in the outermost orbit/energy level

• the atomic number

• electrons in the first orbit/ energy level

How many valence electrons does this element have?

• 2

• 3

• 5

• 10

Which element is shown in the Bohr-Rutherford model in the picture?

• Lithium

• Boron

• Carbon

• Neon

Which of these is the correct Lewis Dot diagram for the element Magnesium?

• 
• 
• 
• 

Which of these is the correct Lewis Dot diagram for the element Boron?

• 
• 
• 
• 

Which of these is not a noble gas?

• Helium
• Argon
• Nitrogen
• Krypton

True or false: Noble gases react with water

• True
• False

Where are the nonmetals located on the periodic table?

• top left corner
• bottom left corner
• top right corner
• bottom left corner