Atoms are the building blocks of all matter and are made up of protons, neutrons, and electrons. Atoms bond together to form molecules, and molecules group together to form substances. The periodic table organizes the elements and groups them based on their atomic structure and properties. Each element is identified by its atomic number, which represents the number of protons, and its symbol, which comes from the element's name.

1. Review
What is matter?
What are the building blocks of all matter?
What is an atom?
What are the three parts of an atom?
The number of ______ determines what kind of
atom it is.
Atoms join together and make__________.
Molecules grouped together make _________.
What tool do scientists use to organize the
elements?

3. How are elements grouped?
They are grouped by how
they look and act.

4. What do the numbers symbolize for each
element? What is the number called?
The number above the element is the
number of protons in the atom
The number is the atomic number

5. What do the letters stand for?
The letters are the symbol for the
element’s name.
The symbol is either the first letter or the
first two letters of the name.
Some of the symbols come from the
elements ancient name- for example gold
is Au-Latin name aurum

6. What makes each element
different?
The number of protons in the atom

7. How do I know how many electrons are in
an element according to the periodic
table?
There must be a balance between the
positively charged protons and the
negatively charged electrons…..
An atom must have an equal number
of protons and electrons

8. What is the difference between
the row and column of the table?
The row- is called a period.
The column- is called a group.