Download Standard EPS Shell Presentation

Tuesday 9/08/16
The Electron Cloud
Area surrounding the
nucleus.
Contains the electrons.
Does NOT contain the
nucleus.
The Questions
What makes atoms “be” different elements?
What is the “atomic number” and what does
it tell us?
What is the “atomic mass” and what does it
tell us?
What does the periodic table tell us?
How atoms of various elements
are different?
Element: a specific atom or group of atoms
that all have the same number of protons.
Atoms of different elements contain
different numbers of protons in their
nuclei.
How atoms of various elements
are different?
Atomic Number: The number of protons in
an atom.
Atomic Mass or Mass Number: The
number of protons plus the number of
neutrons in an atom.
Reading the Map
Key Information
1. Atomic #
= # of Protons
2. Atomic Mass
= (# of Protons) + (# of Neutrons)
3. # of Neutrons = (Atomic Mass) – (Atomic #)
4. #of Electrons
= #of Protons (in a neutral atom)
5. Change the #of Protons, you change the Element!!
6. Change the #of Neutrons, you change the Isotope.
7. Change the # of Electrons, you change the Ion.
Using the Map to Solve Problems
How many protons and how many neutrons are in an
aluminum atom that has an atomic number of 13 and a
mass number of 27?
1.
Name the Element.
1.
2.
3.
Aluminum
Atomic Number is the same thing as the number of
Protons, so 13 Protons.
Atomic Mass – Atomic Number = Neutrons
27
13
=
14
Using the Map to Solve Problems
How many protons and neutrons are in an atom that
has an atomic number of 4 and a mass number of 9?
Name the element.
1.
Name the Element.
1.
2.
3.
Berylium
Atomic Number is the same thing as the number of
Protons, so 4 Protons.
Atomic Mass – Atomic Number = Neutrons
9
4
=
5
Using the Map to Solve Problems
How many protons and neutrons are in an atom that
has an atomic number of 16 and a mass number of 33?
Name the element.
1.
Name the Element.
1.
2.
3.
Sulfer
Atomic Number is the same thing as the number of
Protons, so 16 Protons.
Atomic Mass – Atomic Number = Neutrons
33
16
=
17
Using the Map to Solve Problems
How many protons and neutrons are in an atom that
has an atomic number of 79 and a mass number of 197?
Name the element.
1.
Name the Element.
1.
2.
3.
Gold
Atomic Number is the same thing as the number of
Protons, so 79 Protons.
Atomic Mass – Atomic Number = Neutrons
197
79
=
118
The Answers
What makes atoms “be” different elements?
 The number of protons in an atom determines what element
we call that atom.
What is the “atomic number” and what does it tell us?
 The atomic number tells us the number of protons in an atom
and determines the element.
What is the “atomic mass” and what does it tell us?
 The atomic mass or mass number tells us the number of
protons and neutrons in an atom.
What does the periodic table tell us?
 Many things including the atomic number and atomic mass of
the elements.