Grade 10
Week 2B
Unit 2
Atoms and Elements–
Lesson 2
INVESTIGATING
PATTERNS IN PERIODIC
TABLE pages 83-
Instructions for use
Dear Students,
Please follow the guided lesson power point presentation that covers all your lesson,
activities, pract6ices and Lab .
Always use your notebook to take notes while reading, listening, watching videos and
audios.
Digital lessons and games linked inside it by clicking the video/audio image in the slides.
Throughout the ppp you will have Concept checks, lesson activity, practice and Lab. By the
end of which , you will be able to do the standardized testing practice successfully to
ensure your understanding and readiness for your standardized test.
Lesson will be addressed through at home study and in Class sessions.
What should I do and when
Before class: Watch the video and be ready with your questions for the class
discussion
During class:
11. Watch the video and be ready with your questions for the class discussion
2. Participate in the class discussion through think and share
3. In-class practice
4. Do the lesson activity
After class: AT home practice and take notes of any inquiry you have to share
with your teacher via message on Edmodo or during office hour .
Lesson and
learning Objective
Explore patterns in
the periodic table and
use them to
make predictions about
the behavior of elements.
Analyze how periodic table is
organized.
Identify the patterns of the
periodic table.
Use periodic table to discover
properties of elements and
locate them.
Vocabulary
covered
PERIODIC TABLE
NGSS
connection
HS-PS1-1
Watch this video before coming
to school
it will introduce you to
Topics name : History of periodic table
Video Link: https://www.youtube.com/watch?v=ogpWoB4m-Ns
Topics name : Trends in the periodic table
Video Link: https://www.youtube.com/watch?v=Q4rW0fvkt2g
Topics name : the genius of Mendeleev video
Video Link: https://video.link/w/qpfic
Presentation Guide
Lesson will be addressed as follows :
01
02
SESSION
SESSION
03
04
SESSION
SESSION
Lesson Practice
01
SESSION
Activity rubrics
02
SESSION
How can we study all these animals
in an easy way? BY classifying them into groups
By the Same way the scientists
started to study the elements
known !!!
1869: Dimitri Mendeleev arranged the known elements in order
of mass but he also left in gaps and was able to predict the properties
of unknown elements:
Li
Be B C
N
O
F
Na Mg Al
All of the elements in the same group have
similar PROPERTIES. This is how I thought of
the periodic table in the first place. This is
called PERIODICITY.
 Mendeleev arranged the elements so the
atomic mass increased going down a
column.
 He arranged the columns so elements in the
same row shared similar properties.
 Mendeleev was organizing the elements by
both their atomic mass and by patterns in
their properties.
 He had to leave gaps in order to fit the known
elements into this pattern. He predicted that
each gap represented an undiscovered
element.
 Mendeleev’s table of elements revealed a
repeating pattern, or periodicity, of properties,
hence the name periodic table.
Rutherford
Discovered that
the nucleus
contains Protons
(Atomic number)
1913: Henry Moseley proposed the use of atomic number
rather than atomic mass. Knowledge of the existence of isotopes
also gave evidence to using proton number rather than mass.
Vertical columns are called
GROUPS
92
natural
element
Horizontal rows are called PERIODS
Press on this icon to
view the periodic table
in full-screen mode
 Mosely arranged the elements according to increasing
atomic number
 The difference between the atomic no. of the element
and the previous one is (one).
Periodic
Law
 They are arranged in specific
• 7 horizontal rows called periods
• 18 vertical columns called groups
 Adjacent elements in a period may have similar or
different properties
 elements in the same group have similar properties
03
SESSION
Valence electrons
(outermost electrons)
Most easily gained or lost electrons
during chemical reaction ( when atoms
react together)
They determine the properties of an
element
*location of element on the periodic table
Metals are characterized by having 1, or 2 or 3
electrons in their outermost energy levels.
-Metals of group 1 have only 1 electron in their
outermost energy level.
-Metals of group 2 have only 2 electrons in their
outermost energy level.
-Metals of group 3 have only 3 electrons in their
outermost energy level.
-So, ALL METALS lose electrons to form
positive ions (cations).
Non metals usually contain 5 or 6 or 7
electrons in their outermost energy level
depending on the GROUP NUMBER.
• Nonmetal atoms usually gain electrons to
have completely filled outermost energy
level.
-nonmetal gain electrons to form Negative
ions ( anions)
•
These elements are
metals
This line divides metals
from non-metals
These elements are nonmetals
04
SESSION
Watch the video to answer
the following questions in
your science binder:
1.
2.
3.
4.
What are the physical properties of group 1
What are the special group names for group
1,2 ,17 and 18?
What is the difference between G1 and G2
elements?
Why group 18 elements are unreactive?
Classification of the Periodic Table
Groups with special names:
-Group 1 is called Alkali metals.
-Group 2 is called Alkaline Earth metals.
-Group 7A (17) is called halogens.
-Group 8A (18) is called Noble gases.
-Groups from 3 to 12 are called Transition
metals
Group 1
Very reactive
Alkali
metals
Low melting
point
Alkaline
earth
metals
Metals
transition
metals
• The lanthanides are
shiny, reactive, and soft.
• Actinides are
radioactive, and most
are synthetic elements.
Group 2
High melting
point
Less reactive
than alkali
metals
Group 3 to 12
Less reactive
More brittle
Poor conductors
Lanthanides
Actinides
Most nonmetals are
• Gases at normal
temperatures
• but as solids they tend to be
dull, brittle, and poor
conductors of heat and
electric current.
Non
Metals
Group 17
Extremely reactive
Halogens
Toxic
Colorful gases
Nobel
gases
Group 18
Inert gases
(don’t react)
Metalloids have properties of
both metals and nonmetals
Dull and brittle
Metalloids
Shiny and malleable
Semiconductors
5
SESSION
In class
practice #1
If times allow you do this practice
using the code given by your
teacher
Please go to
Edmodo and solve
• CCQ Wk 2B
• PRACTICE WK2B (Khan Academy )
https://www.khanacademy.org/science/biology/chemistry-of-life/elements-and-atoms/e/atomic-structure
Thanks!
Do you have any questions?
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