Atoms and Periodic table .pdf

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Catalyst
Complete the “Do Now” and
submit!

Objectives
o 

o 

I CAN understand that the atomic number is
unique to each element and is the number of
protons in the nucleus of the element.
I CAN Use the periodic table to understand
important patterns in properties of elements.

Key vocabulary
o 

o 

o 
o 
o 

o 

o 
o 

atom: the smallest unit of matter that cannot be separated
by physical or chemical
subatomic particles: the particles that make up an atom
(PEN)
nucleus: the positively charged center of the atom
proton: positively charged particles in the nucleus of an atom
neutrons: particles in the nucleus of an atom that have NO
charge
electrons: negatively charged particles in atoms. Found
outside the nucleus in an area called the electron cloud
element: any material that is made up of one type of atom
atomic mass unit (AMU): the mass of one proton

Atoms! The Legos of
the Universe

I. The Atom
atom: the smallest unit of an element
that keeps the properties of that
element.
à“atom” is from the Greek word
“atomos” which means “not able to
be divided.”

How small is an atom?
A single penny has 2 x 10^22 atoms or
20,000,000,000,000,000,000,000 atoms

Subatomic Particles
o 

What are three subatomic particles of
an atom?

P
E
N

Proton
Electron
Neutron

II. Inside the atom
All atoms are made of the same 3
subatomic (smaller than an atom)
particles.

II. Inside the atom…


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