All About Atoms
Metals, Bonds, & Gases
100

What happens when electrons move between shells? 

They lose or gain energy

100

What happens during a chemical change? 

Bonds between valence electrons are broken and rearranged. 

200

How do atoms become stable?

By sharing or transferring valence electrons.

200
What happens during a covalent bond? 
Atoms share electrons.
300

Why are valence electrons important? 

They move between atoms, so they are important in bonding. 
300

What happens during an ionic bond?

Electrons are transferred between atoms, forming positive and negative ions.

400

What is an atom's stability based on? 

How many valence electrons it has.

400

Why are noble gases almost never negative in chemical reactions? 

They are stable.

500

Why can't scientists determine the exact location of electrons? 

They don't have a definite position or direction.

500

Why are metals an example of positive ions? 

They lose valence electrons when forming ions.

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