1. Introduction to Atomic Particles

2. Introduction to Atomic Particles
How will I know if I am successful?
I can name and describe three types of atomic particles
Charge
Location
Mass
I can find the atomic number and mass number, and can explain what they represent
I can calculate the number of neutrons in an atom

3. What are atoms? Subatomic particles
An atom a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons
The atom is made up of three different types of particles called
Subatomic particles

4. Protons positively nucleus Mass of 1 amu charged Located in the
Each proton has a (atomic mass unit)
nucleus
Mass of 1 amu

5. Neutrons neutral nucleus Mass of 1 amu particles Located in the
Each neutron has a
neutral
nucleus
Mass of 1 amu

6. Electrons negatively charged Move rapidly in space (in orbits)
Have almost
Around the nucleus
No mass

7. Model of the Atom
The physicist Nils Bohr developed a model of the atom that looked like the picture below.
Part of Atom
Count
protons
neutrons
electrons
nucleus total
total charge 11 12 11 23

8. Parts of the Atom Part of Atom Overall Charge Atomic Weight (amu)
Description (where found?)
nucleus
0 (neutral)
depends on atom
proton
neutron
electron
Centre of the Atom
+1 (positive) 1
In Nucleus
Part of the Nucleus
0 (neutral) 1
In Nucleus
-1 (negative)
Almost 0
Around Nucleus

9. Standard Atomic Notation
is an internationally recognized system that allows anyone to communicate information about the atom

10. Note- In the periodic table, notation looks like this:

11. protons protons neutrons Atomic Number
- Number of (also equal to the number of electrons in a neutral atom)
- Determines the identity of the atom
Mass Number
- the sum of the and in an atom
- mass number = atomic number + number of neutrons
protons
protons
neutrons

12. Calculating Neutrons Number of neutrons = E.g. 2 2 2
Mass Number (protons + neutrons) – Atomic Number (protons)
E.g.
Protons:
Neutrons:
Electrons: 2 2 2

13. Time to practice on your own!