1. Particles in the Atom Objectives:
To draw a diagram of an atom given its atomic notation.
To explain and illustrate the concept of isotopes.
To explain the concept of relative atomic mass.
To calculate the atomic mass for an element given the mass and abundance of the naturally occurring isotopes.

2. Particles in the Atom Electrons
(-) charge no mass located outside the nucleus
Protons
(+) charge amu located inside the nucleus
Neutron
no charge amu located inside the nucleus

3. Subatomic particles Actual e- -1 p+ +1 no mass (g) Relative mass Name
Symbol
Charge
Electron e- -1
1/1840
9.11 x 10-28
Proton p+ +1 1
1.67 x 10-24
Neutron no 1
1.67 x 10-24
The actual mass value is written in what form? Record your answer in your journal as:
Actual mass in ______________________ form.

4. Structure of the Atom There are two regions Electron cloud The nucleus
With protons and neutrons
Positive charge
Almost all the mass
Electron cloud
Most of the volume of an atom
The region where the electron can be found

5. Subatomic Particles equal in a neutral atom Atomic Number
NUCLEUS
ELECTRONS
equal in a neutral atom
PROTONS
NEUTRONS
Negative Charge
QUARKS
Atomic Number
equals the # of...
Positive
Charge
Neutral
Charge
Most of the atom’s mass.
Courtesy Christy Johannesson

6. Subatomic Particles Quarks He component of protons & neutrons 6 types
3 quarks = 1 proton or 1 neutron
LP 1: Quark Combinations
You and your LP record all of the possible combinations that can exist for a proton or a neutron. Record in journal.
Courtesy Christy Johannesson

7. Size of an atom Atoms are incredibly tiny.
Measured in picometers (10-12 meters)
Hydrogen atom, 32 pm radius
Nucleus tiny compared to atom
Radius of the nucleus near m.
Density near 1014 g/cm
IF the atom was the size of a stadium, the nucleus would be the size of a marble.
California WEB

8. Scientific Notation & The Atom
Mass of atom
Size of atom
1.67 x g
9.11 x g
32 pm (smallest atom)
Radius of nucleus m
Density of nucleus 1014 g/cm

9. LP Discussions
What is the connection between scientific notation and the atom?
Record other values that can be expressed in scientific notation.
Complete LP1: Quark Combinations
Drill Scientific Notation/Regular Notation Conversions Get sheet from Ms. Keaise

10. Today in Chemistry, I Reviewed subatomic particles
Reviewed/learned the atom’s makeup
Structure (location of and dimensions of parts)
Properties (mass, size)
Learned the relevance of scientific notation to the chemist
Had LP Discussions on the atom