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Chemistry
September 15th
Pick Up
Warm Up
•Have
your notebook out
and open to a new page.
Title: Atoms & Isotopes
Turn In
•Missing Work
Matter Recap…
•Mixtures
are 2 or more pure substances
physically combined in the same space.
•Homogeneous
= looks like 1
•Heterogeneous = looks like 2 or more
Matter Recap…
•Pure
substances are a set of particles that
are all the same element or compound.
•Compound =
atoms of different elements are
chemically combined in whole number ratios.
ELEMENTS and their ATOMS
•All
matter is composed of atoms.
•Atoms of different elements have different
amounts of subatomic particles.
Parts of an Atom – Subatomic Particles
Protons
Nucleus
Neutrons
Electrons
Electron Shell
Energy Level
Parts of an Atom – Subatomic Particles
•Proton (p+)
•Charge = +1
•Mass
=1
Nucleus
0
•Neutron (n )
•Charge = 0
•Mass = 1
•Electron (e-)
•Charge = -1
•Mass = 0
Concept Check
1.
2.
Where is all of
the atom’s
mass located?
NUCLEUS
What overall
charge does the
nucleus have?
POSITIVE
Concept Check
1.
2.
What charge do the
energy levels have?
NEGATIVE
What is required
for an atom to be
neutrally charged?
p+ = e-
All atoms of the same element have
the same number of protons.
•The
atomic number of an element is the number
of protons in each atom of that element.
•If
the number of protons in an atom change, that
atom would become a different element.
Isotopes
•Atoms of the same element with different masses.
•Same # of protons (atomic number).
•Different
# of neutrons.
•The
mass number is the total number of protons
and neutrons in the nucleus of an isotope.
Mass Number = protons + neutrons
•If…
Mass Number = protons + neutrons
How could you calculate the number of neutrons?
neutrons = Mass Number - protons
Carbon - 13
13
6𝐶
Hyphen Notation
Nuclear Symbol
•Include:
•Include:
•Element
name
•Mass number
•Element
Symbol
•Mass number
(superscript)
•Atomic number
(subscript)
Let’s Practice
Isotope
Hyphen
Notation
Carbon-12
Carbon-13
Carbon-14
Atomic
Number
6
6
6
Mass
Number
12
13
14
Protons Electrons Neutrons
6
6
6
6
6
6
Nuclear
Symbol
6
12
6𝐶
7
13
6𝐶
8
14
6𝐶
Now you try!
–4
•Oxygen – 16
•Magnesium – 26
•Helium
Bohr Model of the Atom
Examples
Carbon-12
Carbon-13
Carbon-14
Now you try!
–4
•Oxygen – 16
•Magnesium – 26
•Helium