SECTION PC 7

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SECTION PC 8B

• BONDING

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TODAY YOU WILL LEARN

• REVIEW
• WHY ATOMS FORM CHEMICAL BONDS
• THAT ATOMS WISH TO BE STABLE
• THAT A STABLE ATOM HAS A FULL OUTER SHELL
• WHAT MOLECULES ARE

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ATOMS FORM BONDS TO

• BECOME STABLE
• TO GET A FULL OUTER SHELL
• HAPPINESS IS A FULL OUTER SHELL

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HAPPY ATOMS
He
Ne
SAD ATOMS
O
H
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ATOMS THAT SHARE

• THESE ARE CALLED COVALENT BONDS
• ELECTRONS ARE SHARED BETWEEN 2 ATOMS

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MOLECULES

• WITH COVALENT BONDS

OK
WILL YOU SHARE WITH ME?
I AM SAD
I AM STABLE I HAVE A FULL SHELL
H
O
I WILL LET YOU USE MY ELECTRON IF I CAN USE YOURS
CAN I PLAY
H
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COVALENT

• MOLECULE

I GET TO USE 8 ELECTRONS IN MY OUTER SHELL
I GET TO USE 2 I ONLY HAVE A SMALL SHELL
O
H
WE ARE STABLE
H
COVALENT BONDS
ME TOO
HAPPINESS IS A FULL OUTER SHELL
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NOT ALL ATOMS SHARE

• SOME STEAL ELECTRONS
• THIS IS CALLED SHIFTING ELECTRONS
• THEY MAKE IONIC BONDS
• THIS RESULTS IN IONS

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IONIC BONDS

• THIS GUY WILL BECOME A NEGATIVE ION

I AM ONLY ONE ELECTRON SHORT
Cl
I NEED TO FIND SOMEONE TO TAKE IT FROM
SOMEONE SMALL AND WEAK
I AM A BULLY
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IONIC BONDS

• THIS GUY WILL BECOME
• A POSITIVE ION

MY LIFE ROTS I HAVE ONE ELECTRON AND I CANT GET
RID OF IT
THE VALENCE ELECTRON HAS A LEPRACY
Na
DOESNT ANYBODY LOVE ME?
IF ONLY I COULD FIND SOME DUMB SUCKER TO TAKE
IT I COULD BE STABLE
YOU SEE MY NEXT SHELL IS FULL AND THAT IS GOOD
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IN AN IONIC BOND

• THE Cl THAT NEEDS AN ELECTRON TAKES IT FROM Na
• BUT Na ACTUALLY WANTS TO GET RID OF THE ELECTRON
• Cl ENDS UP WITH 8
• Na ENDS UP WITH 0

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AN IONIC BOND
Na
Cl
AHH A VICTIM
I MUST GET HIM TO TAKE MY ELECTRON
AHH A VICTIM
I MUST GET THAT WONDERFUL ELECTRON
THE DISEASED ONE
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LATER THAT SAME DAY
Cl NOW HAS 8 ELECTRONS
SODIUM HAS 0 BUT ITS NEXT SHELL IS FULL
Na
Cl
I GOT RID OF IT BUT HOW DO I GET AWAY FROM
THIS CHLORINE?
I GOT THE ELECTRON BUT HOW DO I GET RID OF THIS
SODIUM?
THIS IS AN IONIC BOND
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STILL LATER THE SAME DAY
-

Cl
Na
OH GOOD HE IS LEAVING
OH GOOD HE IS LEAVING
OH NO, I LOST A NEGATIVE
OH GROSS THIS ELECTRON IS NEGATIVE
THAT MAKES ME POSITIVE
THAT MAKES ME NEGATIVE
SINCE OPOSITES ATTRACT THEY ARE ATTRACTED BACK
TO EACH OTHER
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AND THEY LIVED HAPPILYEVER AFTER

• EXCEPT
• Na WAS POSITIVE ALL ITS LIFE
• AND Cl WAS NEGATIVE ALL ITS LIFE
• WHEN DRY THEY CAME TOGETHER TO FORM THE CRYSTAL
  TABLE SALT
• AND SOMEONE PUT THEM ON FRENCH FRIES AND ATE THEM

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IONIC BONDS FORM IONS

• Cl BECOMES A 1 ION BECAUE IT GAINED A NEG.
  ELECTRON
• Na BECOMES A 1 ION BECAUSE IT LOST A NEG.
  ELECTRON AND NOW HAS MORE PROTONS THAN ELECTRONS
• IONIC BONDS BECOME SALTS

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DONT FORGET ABOUT

• MOLECULES 2 ATOMS COMBINED
• COMPOUNDS 2 DIFFERENT ELEMENTS
• MOLECULAR FORMULA SYMBOL FOR A MOLECULE
• CHEMICAL BOND ATTRACTION BETWEEN ATOMS

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DID YOU LEARN

• WHY ATOMS FORM CHEMICAL BONDS?
• TO GET A FULL OUTER SHELL AND BECOME STABLE

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DID YOU LEARN

• THAT ATOMS WISH TO BE STABLE?
• THAT A STABLE ATOM HAS A FULL OUTER SHELL?
• THAT SHARING BONDS ARE CALLED
• COVALENT
• THAT STEALING (SHIFTING) BONDS ARE CALLED
• IONIC

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PRACTICE FOR TOMORROWS QUIZ

• AN ATOM WITH MORE ELECTRONS THAN PROTONS IS
  CALLED A _____
• NEGATIVE ION
• AN ATOM WITH MORE PROTONS THAN ELECTRONS IS
  CALLED A __
• POSITIVE ION
• A MOLECULE CONTAINING DIFFERENT ELEMENTS IS
  CALLED A _________
• CHEMICAL COMPOUND
• THE ATTRACTION THAT HOLDS TWO ATOMS TOGETHER IS
  CALLED A _________
• CHEMICAL BOND

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MORE PRACTICE

• A ______ _____ IS A SYMBOL WHICH REPRESENTS A
  CHEMICAL COMPOUND
• MOLECULAR FORMULA
• MANY ELECTRONS SHARED BETWEEN MANY METAL ION IS
  CALLED A _______
• METALLIC BOND
• A CHEMICAL BOND WHERE ELECTRONS ARE SHIFTED FROM
  ONE ATOM TO ANOTHER IS CALLED A ________ BOND
• IONIC
• Mg BECOMES A ________ ION
• 2

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STILL MORE

• A CHEMCIAL BOND WHERE ELECTRONS ARE SHARED IS
  CALLED A ________ BOND
• COVALENT
• ATOMS IN FAMILY 2A BECOME ______ IONS
• 2
• ATOMS IN FAMILY 7A BECOME _____ IONS
• -1
• WHAT IS THE MOLECULAR FORMULA FOR 2 HYDROGEN
  ATOMS CHEMICALLY COMBINED WITH 1 OXYGEN ATOM?
• H2O
• WHAT DOES CH4 MEAN?
• ONE CARBON ATOM CHEMICALLY COMBINED WITH 4
  HYDROGEN ATOMS

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STUDY