Unit 4: Atoms, electrons, & ions review

Match the following:

• H ¹⁺

• 
• H ^1-

• 
• H

• 

Match the following:

• He ²⁺

• 
• He

• 
• He ^2-

• 

Match the following:

• Li ¹⁺

• 
• Li ^1-

• 
• Li

• 

Match the following:

• Be ²⁺

• 
• Be ^1-

• 
• Be

• 

An atom with an unequal number of protons and electrons is:

• an atom.

• an isotope.

• an ion.

• radioactive.

How many electrons should a neutral atom of carbon have?

• 12

• 6

• 2

• 4

If the number of protons changes, then the atom becomes:

• an ion.

• an isotope.

• a different element.

If the number of neutrons changes, then the atom becomes:

• an ion.

• an isotope.

• a different element.

If the number of electrons changes, then the atom becomes:

• an ion.

• an isotope.

• a different element.

Match the following

• 1 electron in the "cloud"

• 
• 2 electrons in the "cloud"

• 
• 3 electrons in the "cloud"

• 
• 4 electrons in the "cloud"

•