Download B. Atoms are so and

Atoms : Atomic Structure and Models
I. About Atoms
A. Atoms are the building blocks of ___________________.
B. Atoms are so ___________________ and ___________________
that we need to use indirect evidence to study them.
C. The ___________________ of ___________________ that each
atom has determines its chemical properties.
II. ___________________ Atomic Theory
1. All matter is made of ___________________.
2. Atoms of the same ___________________ are the same.
3. Atoms of ___________________ elements are different.
4. Atoms ___________________ to make molecules of compounds.
5. Atoms cannot be ___________________ or
___________________ (by physical or chemical processes).
III. Parts of Atoms
A. ___________________
1. Located ____ ____ ___________ (central part of the atom)
2. Have a mass of ______ atomic mass unit (amu)
3. Have a ___________________ charge
B. Neutrons
1. Located ____ ____ ___________
2. Have a mass of _____ amu
3. Have _______ charge (neutral)
C. Electrons
1. Located ___________ ___ ____ ___________
2. Have a mass of _____ amu
(actually 0.00055 amu but it’s so small that we ignore it)
3. Have a _________________ charge
IV. Models of atoms
Discoveries about atoms have changed how we ______________
atoms.
Name the discovery about atoms that each scientist is famous for:
Dalton ___________________________________________________
Thomson _________________________________________________
Rutherford ________________________________________________
Bohr _____________________________________________________
Schroedinger & deBroglie ____________________________________
V. Periodic Table & Atoms
A. The Atomic number tells us how many _________________ are in
an atom of a certain element.
B. The Atomic number also tells us how many _________________
are in a _________________ atom.
C. The Atomic mass is the total (on average) of the
_________________ + the _________________.
“2 Rules to Remember”
Atomic # = protons = electrons
Atomic mass = protons + neutrons
VI. Rule Breakers
A. ___________
1. Ions have lost or gained _________________.
2. They no longer have the _________________ number of
electrons as protons.
3. Only the _________________ number can change
(remember the electrons are on the outside)
4. This means they have a net _________________.
5. Opposite charges attract, forming _________________
between atoms.
B. _________________
1. Atoms of the same element can sometimes have extra or
fewer _________________ than average.
2. These _________________ forms or weights of atoms are
called isotopes.
3. Isotopes that are heavier or lighter than “normal” can be
_________________.
4. Radioactive atoms have nuclei that can _________________
and give off energy in the process.