Take out notebooks and enter your
information for today.
Atomic Structure Notes
Date: 10/16/2015
 Purpose: Describe the parts of an atom.
Be able to calculate protons, neutrons,
and electrons.
 Notes:

Atomic Structure
https://www.youtube.com/watch?v=o-3I1JGW-Ck What is an Atom?
Atoms

The smallest part of an element that still
has the element’s properties
◦ Remember that elements are on the Periodic
Table and are represented by a capital letter
or a capital letter and lower case letter

John Dalton developed an early atomic
theory that stated atoms could not be
divided
Parts of an Atom

Nucleus is the center of the atom
◦ Contains protons (+ charge) and neutrons
(neutral charge)

The electron cloud surrounds the nucleus
◦ Contains electrons (- charge)
◦ The electrons on the outer energy level are
called valence electrons
Charge of an Atom

Atoms are neutral because the charges of
the protons and electrons cancel each
other
Bohr’s Model

Bohr stated that electrons move around
the nucleus (similar to how the planets
move around the sun)
Model of the Atom
2 electrons
Nucleus
8 electrons
18 electrons
How Do Atoms Look?
Calculating Protons, Neutrons and
Electrons
The atomic number tells us the number
of protons
 Atomic mass – atomic # = neutrons
 Protons and electrons are equal unless
the atom has a charge

Let’s Practice
How many protons, neutrons, and
electrons does Krypton have?
 Protons:
 Neutrons:
 Electrons:

Extra Videos

https://www.youtube.com/watch?v=R1RM
V5qhwyE What is an Atom?
Exit Ticket

How many of the following are in
Krypton?
◦
◦
◦
◦
◦
Atomic #
# Protons
#Electrons
#Neutrons
Atomic Mass
Extra Lesson if needed
White Board Practice with
Elements and Calculations
Assignment

Atomic Basics and The Atoms Family
Math Challenge
10/20/2015

Bell Work
20
How many of the
following does calcium
have?
Protons
Ca
Electrons
40.08
Neutrons
Predicting the Elements

Students will use their knowledge of the
periodic table to predict information
about a mystery element.

https://www.youtube.com/watch?v=fPnwB
ITSmgU Predicting the Elements
Discussion
Periods over Groups
 What are they?
 Where are they?

Read Aloud

Read aloud the “Properties of a Missing
Element” Assignment as a class.
Work as a Group
Work as a group to fill out chart and
details.
 You will have 5 minutes.


Move on to questions 1-4.
Discussion on Predicting Properties
Discussion
 Go over questions as a class

The End
Hand in Assignment
 Complete the back of the Bell Work for
today.

Alien Periodic Table
Isotopes
Atoms with the same number of protons
but different number of neutrons
 The mass of isotopes will differ
 Example:

◦ Potassium-39 and Potassium-40 are isotopes
◦ The # following the element is the mass
◦ Potassium-39 has 20 neutrons and Potassium40 has 21 neutrons