1. Matter Anything that has mass and takes up space (volume) Examples:
A brick has mass and takes up space
A desk has mass and takes up space
A pencil has mass and takes up space
Air has mass and takes up space
All of the above examples are considered matter because they have mass and take up space. Can you think of anything that would not be considered matter?

2. Development of Atomic Models

3. Modern View The atom is mostly empty space wo regions Nucleus
protons and neutrons
Electron cloud
region where you might find an electron

4. + The Atom’s “Center” - - -
Protons and neutrons are grouped together to form the “center” or nucleus of an atom.
Notice that the electrons are not apart of the nucleus + - - -

5. + QUARKS Particles that make up protons and neutrons
Notice the smaller particles that make up this neutron after you take a closer look.
Notice the smaller particles that make up this proton after you take a closer look. +
What do you notice about the number
of quarks in the neutron and proton?

6. Sub-Atomic Particles Weight Comparison (protons, neutrons, electrons)
Neutron = x10-27 kg Proton = x10-27 kg Electron = x10-31 kg - - +
1839 electrons = 1 neutron
1836 electrons = 1 proton +
How do you think the mass of a neutron
compares to that of a proton?
1 neutron ≈ 1 proton

7. What would be the atomic number of this atom?
The number of protons in the nucleus of an atom -
What would be the atomic number of this atom? + - -

8. + Mass Number + What would be the mass number of this atom? - - -
The total number of protons and neutrons in an atom’s nucleus
Expressed in Atomic Mass Units (amu)
Each proton or neutron has a mass of 1 amu
What would be the mass number of this atom? - +
 3
 4 + -
3 protons + 4 neutrons = a mass number of 7 amu
Why did we not account for the electrons when calculating the mass number? -

9. Building Atoms Atoms Protons Neutrons Electrons Carbon 6 Beryllium 4 5
Using the whiteboard and the proton, neutron, and electron chips, build the following atoms, and determine their atomic and mass numbers.
Atoms
Protons
Neutrons
Electrons
Carbon 6
Beryllium 4 5
Oxygen 8
Lithium 3
Sodium 11 12

10. Isotopes
Atoms that have the same number of protons, but have different numbers of neutrons
Examples
Notice that each of these atoms have one proton; therefore they are all types of hydrogen. They just have a different mass number (# of neutrons). - - + + + -
Hydrogen (Protium)
Hydrogen (Deuterium)
Hydrogen (Tritium)

11. Symbols
Contain the symbol of the element, the mass number and the atomic number X
Mass
number
Atomic
# protons
+ # neutrons
mass number
# protons

12. F Symbols 19 9 Find the number of protons number of neutrons
number of electrons
Atomic number
Mass number
= 9 + F 19 9
= 10
= 9
= 9
= 19

13. Br Symbols 80 35 Find the number of protons number of neutrons
number of electrons
Atomic number
Mass number
= 35
= 45 Br 80 35
= 35
= 35
= 80

14. Na Symbols 23 11 Find the number of protons number of neutrons
number of electrons
Atomic number
Mass number Na 23 11
Sodium atom

15. Symbols
If an element has an atomic number of 23 and a mass number of 51 what is the
number of protons
number of neutrons
number of electrons
Complete symbol
= 23
= 28
= 23 V 51 23

16. Today in Chemistry, I completed
Matter Review
Atomic Model Review
Subatomic Particles & Particle Review
Building Atoms
Isotopes
Building Atoms Part 2
In Google Classroom, It’s Elemental Activity