Transcript YouTube- Valence Electrons

8th Grade Science
Do Now
Complete on a sticky note:
The identity of an atom
is determined by…
8th Grade Science
Today’s Schedule
1. Do-Now
2. Properties of matter card sort
3. Label your periodic table
4. Cornell notes
5. Element BINGO
Objectives:
Today we will…
8.5 (A) describe the structure of atoms,
including the masses, electrical charges, and
locations, of protons and neutrons in the
nucleus and electrons in the electron cloud
8.5(B) identify that protons determine an
element's identity and valence electrons
determine its chemical properties, including
reactivity
Dark Matter
8th Grade Science
Valence Electrons-Filled, not
reactive. Noble Gases
1 valence electron=VERY
REACTIVE
4.
Periods
5.
7.
2.
3.
Groups
6.
Element Bingo
8th Grade Science
Fill in your Bingo card with element names from the left. In a random order.
Element Bingo
1. Students will work in groups of 4.
2. The group will decide who will be in charge of the bingo
call list. They will keep track of which cards are called.
3. Stack the Bingo cards face down in the center of the
table.
4. The person at the red seat will begin by reading the top
Bingo card to the group.
5. The group will use their Periodic Table to answer the
question.
6. Each student will mark their answer on their Bingo card.
7. The first person in the group to get 4 in a row wins.
8th Grade Science
Element Bingo
8th Grade Science
Questions after Element Bingo
Answer these in your notebook using complete, reflective sentences.
1.
2.
3.
4.
5.
6.
How are groups and periods helpful in locating an element on the Periodic Table?
What information is needed to identify an element?
How does the reactivity of a metal differ from nonmetals?
Where are the most reactive metals located on the Periodic table?
What determines the reactivity of a metal?
Where on the Periodic Table are the most reactive nonmetals located?
8th Grade Science
Essential Question:
What determines the reactivity of an element?
Questions
Notes
The number of electrons in the
outside orbital are Valence electrons.
These determine how reactive an
element is. (reactive-reacts a lot with
other elements).
-Elements in group 1 are VERY REACTIVE because they
easily lose 1 valence electron.
-Elements in group 18 don’t react, because their outer
orbital is full of electrons. They are called Noble Gases.
The atom to the right has ___ valence electrons,
Atomic Structure
How many valance electrons does this element have?
8th Grade Science
8th Grade Science
Atomic Structure
Which group?
Which period?
1
H
1.008
Hydrogen
8th Grade Science
Atomic Structure
Which group?
Which period?
8
O
15.999
Oxygen
8th Grade Science
Atomic Structure
Which group?
Which period?
11
Na
22.999
Sodium
Atomic Structure
How many valence electrons?
8th Grade Science
Atomic Structure
How many valence electrons?
8th Grade Science
Atomic Structure
Which element is in period 4 and has 1 valence electron?
8th Grade Science
Atomic Structure
Which element is in period 2 and has 2 valence electrons?
8th Grade Science
Atomic Structure
Which element is in period 3 and group 17?
8th Grade Science
Atomic Structure
Which element is in group 2 and has 7 valence electrons?
8th Grade Science
Atomic Structure
Which is more reactive: lithium or neon?
8th Grade Science
Atomic Structure
Which is more reactive: argon or potassium?
8th Grade Science
Chemistry Video
8th Grade Science
Brainpop – Atomic Model
Ions- This is why chemical reactions happen.
YouTube- Valence Electrons. They don’t have to know about electron configuration,
but it will let them know where they are headed with this in high school.
Watch the Brainpop videos if you have time at the end.
8th Grade Science
Compare and Contrast Elements
Work with your shoulder partner to complete the following:
Sodium
Atomic #
Proton #
Electron #
Neutron #
Atomis mass
group
# valence electrons
reactivity
metal, nonmetal, or metalloid
Aluminum
# energy levels
period
8th Grade Science
Compare and Contrast Elements
Sodium
Aluminum
Atomic number =11
Atomic number =13
11 protons
13 protons
11 electrons
12 neutrons
Metals
13 electrons
3rd period
14 neutrons
Atomic mass=22.99 amu 3 energy
levels
1st group
Atomic #
Proton #
Electron #
Neutron #
Atomis mass
Atomic mass = 26.982
amu
1 valence electron
13th group
Very reactive metal in 3rd
period.
3 valence electrons
Least reactive metal in
3rd period.
group
# valence electrons
reactivity
metal, nonmetal, or metalloid
# energy levels
period
8th Grade Science
Today’s Schedule
1. Do-Now
2. Properties of matter card sort
3. Label your periodic table
4. Cornell notes
5. Element BINGO
Objectives:
Today we will…
8.5 (A) describe the structure of atoms,
including the masses, electrical charges, and
locations, of protons and neutrons in the
nucleus and electrons in the electron cloud
8.5(B) identify that protons determine an
element's identity and valence electrons
determine its chemical properties, including
reactivity
Dark Matter