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1.
What particle(s) contribute
to the:
a) Atomic number
b) Atomic mass
c) Charge
• Atomic Number = # p+
• Atomic Mass = #
+
p
• Charge = # p+ - # e-
+#
0
n
Subatomic Particles
Subatomic
Particle
Mass (amu)
Location
Charge
Proton (p+)
1 (1.673 * 10-27 kg)
Nucleus
+
Neutron (n0)
1 (1.675 * 10-27 kg)
Nucleus
0
Electron (e-)
0 (9.1 * 10-31 kg)
Orbiting Nucleus
-
Ions
 Atoms
that represent the same
element but have a net charge.
 Formed with an atom gains or
loses electrons.
 Why doesn’t an atom form if we gain
or lose protons?
Activity
•Everyone pick a number between
5 and 20. Write this number on
your note card.
•Take that number of beans and
keep them on your desk.
Activity
•The number on your note card
cannot change. What does this
represent in an atom?
•The beans represent electrons.
•What charge are you right now?
•
# p + - # e(# on card - # of beans)
Activity
•Leave your cards on your desk.
•Girls can give away up to 3 beans.
They cannot accept any beans.
•Boys can accept only 3 beans
total. They cannot give any away.
•When you finish exchanging
beans return to your seat.
Activity
•Count your number of beans and
calculate your net charge.
•
# p+ - # e(# on card - # of beans)
Cations and Anions
•Cation: An ion with a positive
charge. These ______ electrons.
•Anion: An ion with a negative
charge. These ______ electrons.
What type of ion did you
represent in the activity?
Writing Ions
Ion
Charge
Element
Symbol
Superscripts tell us the charge of ions.
Practice
Element
# p+
Calcium
# e-
Charge
Gained or
lost
electron(s)
Written
Ion
Cation or
Anion
18
16
Fluorine
18
-1
13
+3
N-3
Mg+2
HOMEWORK: Page 13 in your study guide packet.
Review Ions

Ions represent the same element but
have different __________.

Ions of the same element differ in the
number of ________.

How would you write the calcium ion
that has a +2 charge?
Isotopes
•Atoms that represent the same
element but have different masses.
•Atoms that have the same number
of protons but a different number of
neutrons.
•Why doesn’t an isotope form if we
change the number of protons?
Isotopic Symbol
This is the isotopic symbol for an isotope of
nitrogen. What do the numbers represent?
Isotopic Notation
Atomic
mass
Element
Symbol
Atomic
number
Carbon-12 or C-12
Isotopes of Hydrogen

A. hydrogen (hydrogen-1)
 # p+ =
# n0 =
 Isotopic Symbol:

B. deuterium (hydrogen-2)
 # p+ =
# n0 =
 Isotopic Symbol:

# e- =
# e- =
C. tritium (hydrogen-3)
 # p+ =
# n0 =
 Isotopic Symbol:
# e- =
Practice

Complete the table for carbon isotopes
on your notes page.

Go back to page 11 and complete the
first two columns (Isotopic Name and
Isotopic Symbol).
Representing Isotopes and Ions
 How
do we write an ion in shorthand?
 What
 Is
does an isotopic symbol look like?
there a way these two shorthand
symbols can be written in one symbol?
Complete Isotopic Symbol
Atomic
mass
Ion
Charge
Atomic
number
Element
Symbol
Practice

Go back to page 13 and complete the
first column (Complete Isotopic Symbol).

Homework: Pages 9 and 10 in your
study guide packet.
Next quiz: Friday (Beanium Lab Quiz)
 Unit test: November 7
