Download Week 9 CCA Test Review

Week 9 CCA Test
Review
Labeling an atom
Electron
Neutron
Proton
Nucleus
Energy Level
Fill in the table:
Subatomic
Particles
Charge
Proton
Positive
1 amu
Negative
0 amu
No charge
1 amu
Electron
Neutron
What is the atomic mass?
Atomic mass: the mass of an atom
Protons
+ Neutrons
Atomic Mass
What is the atomic number?
 Atomic number:
Element number
used to show
where on the
periodic table the
element is found.
Also, it is the
number of protons.
Atomic Number = Number of Protons
What are valence electrons?
 Atoms in the outside energy level, used to
determine reactivity of an atom
How can you find the number of
neutrons?
Atomic Mass
- Atomic Number (protons)
Neutrons
How do you know if an atom is neutral?
Protons (positive charges) = Electrons (negative charges)
 If it has the same number of positive (protons) and
negative (electron) charges
3 positive charges
3 negative charges
Remember: all elements on the periodic table are neutral!
Fill in the missing information
Atomic Mass
Atomic Number
Protons
2-8-8 Rule
Neutrons
Octet Rule
Electrons
Energy Levels?
Valence Electrons
Is this a stable atom?
Is this a neutral atom?
Element?
Element symbol?
9
4
4
9-4=5
4
2
2
No - Valence level is not full
Yes – protons = electrons
Beryllium
Be
Bohr Model
Octet (2-8-8) Rule
 First energy level can hold 2 electrons
 Second energy level can hold 8 electrons
 Third energy level can hold 8 electrons
What do valence electrons
determine?
 They determine how reactive an atom is
 1 and 7 valence electrons – most reactive
 8 valence electrons – least reactive
 Determine how am atom will bond
 1 valence electron – give away
 7 valence electrons - steal
What is an ionic bond? When does
this happen
 Ionic bond: when valence
electrons are given or
taken in order for
elements to bone
 This happens when an
atom needs to give or
take 1, 2, or 3 valence
electrons to be stable
What is an covalent bond? When
does this happen?
 Covalent bond: when
atoms bond by sharing
valence electrons
 This happens when
atoms share and
become stable
How is the Periodic Table arranged?
 By atomic number (number of protons)
 Groups (valence electrons) and Period
(energy levels)
 Physical and Chemical properties
Color Metals, Non-Metals, and Metalloids
Put a circle around the non metals
that are gasses
Label Groups and Periods
Most reactive groups
Group 1
Group 17
Least Reactive Group
Noble Gasses – Group 18
What information can be found if you
know the Period of an element?
 Number of energy levels
What information can be found if you
know the group of an element?
 Number of valence electrons
Remember
to cover the
one on the
two digit
numbers!
Most reactive groups
Group 1 Why?
Group 1 only has one valence electron
and group 17 only has 7. They are
both 1 valence electron
away
Group
17 from
being stable (happy).
Least Reactive Group
Why?
Group 18 has 8 valence electrons
which fills up the valence level,
Noble Gasses – Group 18
meaning the atom is stable (happy)
Why do elements with similar valence level of
electrons have similar chemical properties?
 They will react the same way, because they
have the same number of valence electrons
What has similar physical and
chemical characteristics to Nitrogen?
 Any element that is in the same
family/group
Nitrogen Family
Argon - Protons
Remember: Atomic number = protons
Protons = 18
Sodium – Atomic Mass
Atomic Mass = 22
(drop the decimals)
Carbon - neutrons
Remember: Atomic mass – atomic number = neutrons
Neutrons = 6
Neon – atomic number
Atomic Number = 10
Potassium – Valence Electrons
1st group = 1 valence electron
Valence electrons - 1
Potassium – Valence Electrons
2nd Period = 2 energy levels
Energy Levels Used - 2
Oxygen Bohr Model
Review from Unit 1
Physics
Newton’s 3 Laws
1. An object at rest will stay at rest, and an
object in motion will stay in motion unless
acted upon by an outside force
2. F=ma
3. For every action there is an equal and
opposite reaction
Balanced and Unbalanced Forces
 Balanced – not moving
 Unbalanced – moving (creates a net force)
Equations
 Speed = D/T
 Acceleration = change in speed/change in time
 Force = ma
 Work = Force x distance