untitled

Which is an electron?

• A
• B
• C

How many electrons go in the first shell (ring) ?

• 6

• 8

• 4

• 2

This is a Bohr Diagram of Aluminum. How many valence electrons does Aluminum have?

• 3

• 4

• 5

How many valence electrons does Tin (Sn) have?

• 8

• 7

• 5

• 4

How many valence electrons does Lithium (Li) have?

• 8

• 1

• 5

• 2

How many valence electrons does Bromine (Br) have?

• 5

• 6

• 7

• 8

What is a valence electron?

• an electron that is found in the outermost shell of an atom. 
• an electron found in the innermost shell of an atom.
• an electron found in the middle shell.

Which of these is incorrect?

• 
• 

Which of these is correct?

• 
• 
• 

This could be the dot diagram of 

• Ne
• Si
• Al
• Be