```The Periodic Table
• The Periodic Table gives us SO much information
about the world around us, but first you have to
Each of these
little squares
one specific
element.
An Element
• Where an element is on
the table can give you a
it.
• We are going to look at
what information you
can find out from each
element’s square on the
Periodic Table.
5
B
Boron
10.811 amu
This is what the
square for Boron looks
like.
An Element
• Find Boron on your
periodic table.
• A basic periodic table will
give you these four pieces
each element. We will go
over each one and what
they mean.
5
B
Boron
10.811 amu
Atomic Number
• This is the Atomic Number
for Boron.
• The atomic number tells you
how many protons and
electrons an atom of Boron
has. (So Boron has 5 protons and 5 electrons).
• The elements are also arranged
on the Periodic Table so that
the atomic numbers go in
order.
5
Chemical Symbol
• This is the Chemical Symbol
for Boron.
• The chemical symbol is the
same no matter what language
• Every element has a unique
chemical symbol.
• The first letter is always
capitalized. If there is a second
letter, it is always lowercase.
B
Chemical Name
• This is the Chemical Name.
• The chemical name may be
different for a scientist
viewing the table in a
different language.
Boron
Atomic Mass
• This is the Atomic Mass
of Boron.
• Atomic mass is
measured in Atomic
Mass Units (amu’s).
• It is the sum of the mass
of all of the protons,
neutrons, and electrons
in one atom of Boron.
10.811 amu
Atomic Mass (continued)
• Electrons have very little
mass. So little that they
barely register in the
atomic mass.
• For this reason, the
atomic mass really only
measures the mass of the
protons + the neutrons.
10.811 amu
Atomic Mass (continued)
• Protons and Neutrons
• Because they weight 1
amu and we know how
many protons each
atom has – it is easy to
figure out how many
neutrons each atom has.
10.811 amu
Neutrons
To find the number of
neutrons:
1st – Round off the atomic mass to the
nearest whole number
• 10.811 rounds to 11
2nd – Subtract the number of protons (the
atomic number) from your new atomic
mass
• 11 – 5 = 6
The answer is the number of
neutrons the atom has!
5
B
Boron
10.811 amu
Neutron Practice
Let’s practice on a new element!
•
What is the atomic number for Fluorine?
•
What is the atomic mass of Fluorine?
•
What would you round the atomic mass
too?
•
__________ - ___________ = _________
(rounded atomic mass )
•
(atomic number)
(neutrons)
9
F
Fluorine
How many neutrons does Fluorine have?
18.998404 amu
```