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Chemical Compounds
DO NOW
Label the atom- proton, neutron,
electron, nucleus. Label charges
where they belong. (+) (-)
Elements
• A pure substance that consists of just one type of
atom
• Classified by the number of protons/electrons
Elements
• A pure substance that consists of just one type of
atom
• Classified by the number of protons/electrons
• REMEMER– the number of PROTONS is EQUAL to
the number of electrons!!
“atomic number”
= How many
protons/electrons
a Boron atom has
Elements
• A pure substance that consists of just one type of
atom
• Classified by the number of protons/electrons
• REMEMER– the number of PROTONS is EQUAL to
the number of electrons!!
• Atoms have NO CHARGE… NEUTRAL
CHALLENGE: What element is this??
How to solve a challenge question
• “I see that……”
• “I know that…..”
• “I think that…….”
Chemical Compounds
• 2 or more elements combined
Chemical Compounds
• 2 or more elements combined
• Example- H2O
Chemical Compounds
• 2 or more elements combined
• Example- H2O
– Hydrogen Hydrogen Oxygen
(K2SO4P5) + Mg2Fe32+  (KSO43-)2 + KCl + CuPO42-
Chemical Compounds
• 2 or more elements combined
• Example- H2O
– Hydrogen Hydrogen Oxygen
• Elements “combine” to one another by
chemical bonding
Chemical Bonding
• When 2 or more elements bond together, the
result is often very different than the original
elements
• Bond- join, combine, or come together
• Original- what you started with
Chemical Bonding
• Elements bond together, or combine/join with
other elements by stealing or sharing electrons
from other elements.
• Chemical bonds happen because of electrons
Ionic Bonding
• Elements take or give away electrons
Covalent Bonding
• Elements share electrons
Sodium
1
2
7
6
3
5
Sodium
4
Chlorine
1
2
7
6
3
5
Sodium
4
Chlorine
1
2
7
6
3
5
Sodium
4
Chlorine
IONIC BONDING- stealing and giving away electrons
1
2
7
6
3
5
Sodium
4
Chlorine
CHALLENGE
What do you think the charge of the sodium
atom and the charge of the chlorine atom is
Now that they are bonded? Why?
CHALLENGE
What do you think the charge of the sodium
atom and the charge of the chlorine atom is
now? Why?
REVIEW
• What is an atom?
• What are the 3 subatomic particles?
• What is the overall charge of an atom, and
why?
Review
• What is an element?
• What does the “atomic” number tell us?
• What are some examples of elements?
Review
• What is a chemical compound?
• How do chemical compounds form?
REVIEW
• How does chemical bonding happen? (what
does it involve?)
• What are the 2 types of chemical bonds we
have learned about?
REVIEW
• Someone explain ionic bonding.
• Some explain covalent bonding!