Ions

1. Ions Biochemistry

2. Can an atom gain or lose an electron? Explain. • Yes • Atoms that are said to be un stabled or reactive have more of a chance to gain or lose an electron.

3. Where would the electrons come from? • The electrons that are gained or lost come from the outer energy level (shell). • This outer shell is referred to as the Valence shell.

4. How many electrons can fit into the shells of an atom? • First energy level – 2 • Second energy level – 8 • Third energy level – 18 • Fourth energy level - 32

5. How many electrons are needed in the valence shell for it to be stable? • Elements want to have 8 in their valence shell to be stable.

6. Which elements would be more likely to gain or lose electrons? • The elements with 7 in the outer energy level will gain electrons. • The elements with one in the outer energy level lose an electron.

7. What would happen to an atom when it gains or loses an electron? • The charge would change it would either become positive or negative charge. • If an atom loses an electron it becomes positively charged. Also called Cations. • If an atom gains an electron it becomes negatively charged. Also called anions.

8. Ion Picture

9. Practice: Atom Vs. Ion • Draw the electrons in their shells and predict the whether or not it has the chance to become an ion and what charge it would be. K Br Be N Ar H