Download Chapter 2 Section 2

WARM-UP: 10/20
What
is an atom?
What are the three main parts
of an atom.
How do the particles of an
atom differ in electrical charge?
WARM-UP
List
how many protons and
electrons the following
elements have: Hydrogen,
Sodium, Iron, and Krypton
WARM-UP
 Take
a periodic table from the front
table, choose 3 colored pencils and
create a color coded key for solids,
liquids (only 2 on the table), and
gases.
WARM-UP
Draw
the atomic structure of
an element from the periodic
table.
Label the nucleus, protons,
neutrons, electrons and
charges.
WARM-UP
Construct an analogy:
Atom:Element as ________: _________
THE ATOM AND THE PERIODIC TABLE
OBJECTIVES

Describe and define atoms.

Recognize that all matter is made up of atoms
and atoms of the same element are all alike,
but are different from the atoms of other
atoms.

Describe the relationship between numbers of
protons and atomic number on the periodic
table.
ESSENTIAL QUESTIONS
What
is the relationship
between atoms and elements?
How
are atoms of one element
similar to and different from
atoms of other elements?
WARM-UP: 03/01
 Copy
down your homework
 Read your NEW objective, agenda,
and essential questions
 Pick up a copy of your homework off
the stool and start reading it
 Make sure you have a pen/pencil
What is a
pure
substance?
Is a substance in
which there is a
uniform composition
of “particles”. The
particles we are
talking about are
atoms.
What is
an
element?
meet the
elements
song
A substance that
Contains only one type
of atom. All known
elements are
organized on the
periodic table of
elements.
atoms and elements
What is a
compound?
Is a combination of
elements that come
together through a
chemical reaction
and becomes
something called a
molecule.

A molecule is two or
more different elements
combined in a specific
ratio.
The
smallest
part
What is an
of an element
atom?
that has the
atom video w same
animation
properties of that
element. In Greek
means“Uncuttable”
Atom cont…
What
is
an atom?
These
particles
are too small to
be seen with a
microscope.
Atoms have all
the properties of
matter: mass and
volume
Superman
Study Jams atoms
What Is
an atom
Made
of?
Atoms on discovery ed.
Protons –
Found in the
atom’s nucleus
and has a
positive charge.
+
protons
What Is
an atom
Made
of?
Neutrons –
Found in the atom’s nucleus
and has no charge. The
nucleus contains most of the
atom’s mass
n
What Is
an atom
Made
of?
-
Electrons –
Found circling
the atom’s
nucleus.
- Each has a
negative charge.
Electrons
LABEL ME!
1.
3.
2.
4.
What is the
atomic
number?
The atomic number
is the number of
Protons in the
nucleus of that
atom. All atoms of
an element have
the same atomic
number.

Here is an example of one of the
elements on the periodic table.
3
Li
Lithium
6.94
atomic number - # of
protons in the nucleus.
element symbol
element name
atomic mass –mass of the
protons and neutrons
WHAT IS THE ATOMIC NUMBER?
Mass #
Isotopes
HOW DO ATOMS OF DIFFERENT ELEMENTS
DIFFER?

Starting Simply The hydrogen atom has one proton
and one electron.

Now for Some Neutrons The helium atom has two
protons, two neutrons, and two electrons.

Building Bigger Atoms For bigger atoms, simply
add protons, neutrons, and electrons.

Protons and Atomic Number The number of
protons in the nucleus of an atom is the atomic
number of that atom. All atoms of an element have
the same atomic number.
OBJECTIVES REVIEW
 Describe


and define atoms.
Name the parts of an atom.
Describe the relationship between
numbers of protons and atomic
number on the periodic table.
ESSENTIAL QUESTIONS
How
is matter alike or different
on the molecular level?
How
is the # of Protons related
to the atomic # on the periodic
table?