1. Atom
Def: The smallest particle of an element or
matter

2. Atoms are used to create the elements.
Elements are used to create everything in the world..
So far, there are over 100 known elements.

3. Element
Def: A substance made up of only one KIND of atom. In other words, all of its atoms are identical (the same). It is a pure substance.

4. Gold is an element.
An element is a substance which cannot be broken down into simpler substances under normal circumstances.
This means that if you break gold down into smaller and smaller pieces, it will still be gold.
Gold is made of nothing
but gold.
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5. Gold cannot be broken down into any other substances.
The smallest, tiniest piece of gold
is an atom of gold.
An atom is the smallest unit of an element.

6. Periodic Table Where do we find the list of all the elements? song
Click box
for song
song

7. Oxygen (65%)
Carbon (18%)
Hydrogen (10%) THE HUMAN BODY
Nitrogen (3%)
Calcium (1.5%)
Phosphorus (1.0%)
Potassium (0.35%)
Sulfur (0.25%)
Sodium (0.15%)
Magnesium (0.05%)
Copper, Zinc, Selenium, Molybdenum, Fluorine, Chlorine, Iodine,
Manganese, Cobalt, Iron (0.70%) Lithium, Strontium, Aluminum,
Silicon, Lead, Vanadium, Arsenic, Bromine (trace amounts)

8. The Periodic Table
Dimitri Mendeleev was the Russian scientist who developed the modern Periodic Table
The Periodic Table is an arrangement of all elements in order of atomic number.

10. What is the chemical formula for water?
H2O
oxygen
hydrogen

11. This is a molecule of water.
Is it a pure substance?
NO! Because I can separate it into two kinds of elements.
We call these compounds.
Compound - a substance made up of more than
two or more elements bonded
together

12. Salt is not an element.
Salt can be broken down into simpler substances--sodium and chlorine.

13. Salt is not an element.
Salt can be broken down into simpler substances--sodium and chlorine.
Salt is made up of more than 1 element.
We call that a ____________.
compound.

14. Let’s make models!

15. Find the element lithium on the periodic table.
Tells how many protons
are in the atom of lithium
Is the symbol for lithium.
Tells the mass of the atom of lithium

16. The symbol for beryllium is

17. What is the symbol for
beryllium? Be
What do you notice about
the first and last letters of the
symbol?
The first letter is always a capital
and the following letters are
always small letters.

18. Why do you think the second letter is not
a capital?
NACLO NaClO
How many
elements are
shown?
Sodium
Chloride
Oxygen
Cannot tell

19. Sugar is made up of more than one element, so sugar is a/an
mixture
compound

20. Salt is made up of 2 elements. So salt is a
_______________.
Salt is made up of sodium, which has the
symbol _______ and chloride which has
the symbol __________.
We can represent salt with the formula_________.
compound Na Cl
NaCl
In a compound, the different
elements are chemically bonded
together.

21. K3CrO2 A formula tells us what elements are in matter
and how many atoms there are of the element.
K3CrO2
2 atoms of
oxygen
3 atoms of
potassium
1 atom
of chromium
These atoms are bonded together chemically!

22. H2O2 HCl NaH2CO3 Write down these formulas. Tell what elements
they are made up of and how many atoms there
are in each substance.
H2O2
HCl
NaH2CO3
2 atoms hydrogen, 2 atoms oxygen
1 atom hydrogen, 1 atom chloride
1 atom sodium, 2 atoms hydrogen
1 atom carbon, 3 atoms oxygen
Why are these compounds?
More than 1 type of
element is bound together.

23. Is this a compound? Li
Yes No

24. Is this a compound? KCl
Yes No

25. How many elements are in this compound? CO21 2 3 4

26. Is this a compound O2 .
Yes No

27. Draw the picture below. Label each of the boxes.
The circles represent atoms of an element.
Element
Mixture
Compound

28. O2 NaCl H CO2 Li2 Which of the above are elements?
Li2 CO2 O2
O H NaCl
Li O H
None of the above