Grade Level
8
Quarter
Teacher
ARNEL R. LETADA
School
Learning Area
CHEMISTRY
Teaching Dates
THIRD QUARTER
FAEMHS, Mandaon National
High School
November, 2018
I. OBJECTIVES
A.
Content Standards
Demonstrates understanding of the identity of a substance according to its atomic structure.
B.
Performance Standards
Makes a chart, timeline, or multimedia presentation of how the different models have evolved
C. Learning Competencies
II. CONTENT
Determines the number of protons, neutrons and electrons in a particular atom
The Atomic Structure
III. LEARNING RESOURCES
A. References
1. Teacher’s Guide pages
2. Learner’s Materials pages
3. Textbook pages
4. Additional Materials from
Learning Resource (LR)
portal
Page 200-204
Page 203-204
Page 103-106
Modern Periodic Table of Elements and Worksheets
IV. PROCEDURES
A.
ELICIT
Ask the learners to answer the 5-item pre-test.
Choose the term that best completes the second relationship.
1. Female : male
proton : _________
a) atom
b) electron
c) neutron
2. Cow : horse
neutron : ________
a) proton
b) nucleus
c) atom
3. Atom : proton
house : _________
a) school
b) nucleus
c) planet
4. Black : white
cation: _________
a) anion
b) sodium ion
c) metal
5. plant : oak
anion : _________
a) sodium ion
b) magnesium ion
c) cation
d) quark
d) quark
d) brick
d) iron ion
d) chloride ion
Present a sample information of an element and let them analyze the given data to answer the
following guide questions:
B.
ENGAGE
1.
2.
3.
4.
C. EXPLORE
How is the number of electrons derived?
What will be the number of neutron/s of the given sample?
How do we get the atomic mass of an element?
What particle accounts for the atomic mass of an element?
Activity Card
Grade Level
8
Quarter
Teacher
ARNEL R. LETADA
School
Learning Area
CHEMISTRY
Teaching Dates
THIRD QUARTER
FAEMHS, Mandaon National
High School
November, 2018
In a group of 5, the students will complete the table. (Note: RED numbers are the answers
but those items will appear blank in the students’ activity card)
Element
Atomic
Mass
Number of
Number of
Number of
Number
Number
Protons
Neutrons
Electrons
Boron
5
11
5
Bromine
35
80
35
Carbon
6
12
6
Copper
29
64
29
Mercury
80
201
80
Neon
10
20
10
Nitrogen
7
14
7
Oxygen
8
16
8
Potassium
19
39
19
Sulfur
16
32
16
Questions:
1. How do we derive the number of protons?
2. Explain how the atomic mass of an element is determined.
3. Is it important for the subatomic particles to combine? Why?
6
45
6
35
121
10
7
8
20
16
5
35
6
29
80
10
7
8
19
16
Ask the student to present their output and process their insights afterwards.
Also discuss the answers to guide questions.
D. EXPLAIN






E.
F.
ELABORATE
EVALUATE
The present model of atom consists of electrons moving in the space around the nucleus.
The nuclei of atoms of given elements have the same number of protons but may differ in the
number of neutrons.
The atomic number is the number of protons in its nucleus.
The atomic number is also the “identity number of an atom. No two elements have the same
number of protons in the nuclei of their atoms.
An atom is neutral. The number of protons inside the nucleus is equal to the number of
electrons around it.
The mass number of an atom is the sum of the combined numbers of protons and neutrons
in the nucleus of the atom.
Cite the significance of elements in our daily life.
Gather the students’ insights/generalization regarding the lesson at hand.
Consider the following atoms:
A
B
C
D
# of Electrons
6
6
6
7
# of Neutrons
6
7
8
7
# of Protons
6
6
6
7
1.
2.
3.
4.
5.
How many electrons are there in atom B? 6
What is the atomic mass of atom C?
14
Which atoms have the same atomic mass? CDE
For which atom(s) is the atomic number 7? DF
What is the atomic number of atom E?
8
E
8
6
8
F
7
8
7
Grade Level
8
Quarter
Teacher
ARNEL R. LETADA
School
Learning Area
CHEMISTRY
Teaching Dates
THIRD QUARTER
FAEMHS, Mandaon National
High School
November, 2018
Research about the BIOPLASTIC and using the table below, identify the elements present in the said
product with their number of protons, neutrons, and electrons.
Element
Protons
Neutrons
Electrons
G. EXTEND
V. REMARKS
VI. REFLECTION
A. No. of learners who earned 80% in the evaluation
B. No. of learners who require additional activities for remediation
C. Did the remedial lessons work? No. of learners who have caught
up with the lesson
D. No. of learners who continue to require remediation
E. Which of my teaching strategies worked well? Why did these
work?
F. What difficulties did I encounter which my principal or supervisor
can help me solve?
G. What innovation or localized materials did I use/discover which I
wish to share with other teachers?
PREPARED BY:
ARNEL R. LETADA
MAED-SCIENCE ED.
SUBMITTED TO:
ERDEE C. CAJURAO
INSTRUCTOR