ELEMENTS AND COMPIUNDS

1. Republic of the Philippines
Department of Education
REPUBLIC COLLEGES OF GUINOBATAN, INC.
G. Alban Street, Iraya, Guinobatan, Albay
E-mail Address: republiccolleges@yahoo.com
CP No.:0946-419-3153
Science 7
Quarter 1 – Module 3 Elements
and the Periodic Table
Name:

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All the things around us - from the air we breathe
to the book we are holding - are made of elements and
compounds. The elements that scientists have
discovered are organized in the Periodic Table of
Elements. The periodic table helps us become familiar with
the properties of the elements.
Getting to know the elements and its periodic
table is like having a very important map which is a key
to unlocking the treasures in Chemistry.
Do you want to acquire this map? Read on and
perform the activities prepared for you in this module.
At the end of the module, you should be able to:
Supplementary Learning Module for Junior High School Learners
LESSON
ELEMENTS AND THE PERIODIC TABLE
 Identify the names and symbols of elements in the
periodic table.
 Familiarize the location and family/group number of
elements in the periodic table.

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Hi! How did you find the test?
Please check your answers in the answer key section and
see how you did. Don’t worry if you got a low score, this just
means that there are more things that you can learn from
this module. So, hop on!
d. Sc
Directions: Identify what is being asked or described in each
item. Write the letter of the correct answer.
1. What element has the symbol Cl?
a. Carbon
b. Calcium
c. Chlorine
d. Cobalt
2. Which of the following elements has the ancient name of Argentum?
a. Mercury
b. Silver
c. Lead
d. Iron
3. How many elements are there in the Periodic Table?
a. 201
b. 192
c. 118
d. 100
4. The following elements belong to the same group, EXCEPT ONE. Which element is it?
a. Magnesium
b. Calcium
c. Radium
d. Zinc
5. Which of the following is the symbol of Sulfur?
a. S
b. Si
c. Sr

4. 4
THE SAGA OF THE GOLD DUST KID
Directions: Read the story The Saga of the Gold Dust Kid and fill in the blanks with the words that
correspond to the letter symbols. Do this by:
1. Looking for the given letter symbol on the special tool located on page X.
2. Writing the word below the letter symbol. (Example:
letter symbol: H; word: Hydrogen)
1. What is the name of the kid’s horse?
2. In what city was the kid headed to?
If your answer to question 1 is Boron and your answer to question 2 is Samarium, then you are on
the right track! You can now proceed to the next paragraphs.
Inhaling a deep breath of O , he coughed on the
S blowing from the nearby mills.
The Hg was falling yet he thirsted. He drank a lot
of water and tasted the Cl all big cities have. He
headed north and felt his bones ache from Ar
deposit build-up due to years of riding
the Zn trail.
An artist, drunk with wine full of ethyl alcohol and semi-
poisoned from the Cd deposits in his body
waved him on. He noticed a faint spark from a distance
made by the burning of methane and
P compounds but it did not scare him.
The kid rode his favorite horse named B .
Strapping his shooting Te to his side, he
headed out for the Ne -lit city of
Sm .

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He rode on until he spotted the bank rumored to be the
safekeeping place of a Pt bell. A lone sheriff with a Sn
badge guarded it. “Freeze,” the
kid yelled, “or I’ll fill you up with Pb
! The sheriff drew his Cr plated gun,
but he was too slow. (Continued on the next page)
The kid’s gun blazed like flaming Mg in the
moonlight. A barmaid with hair that shone like
Cu ran as fast as she could when the kid pulled
out some N compound from his saddlebag threatening to
blow into pieces an
Al coach that stopped by.
Amidst all the confusion, a shout rang out, “Hi ho Ag
and a masked man on a silvery horse raced
across the Si sands like Na
skittering in the water. He was the famous
Lone Ranger who delivers justice with an Fe
hand. The kid tried to resist the arrest but he was
powerless against the lawman who would not have been
stopped even by a U bomb.
The kid has met his doom and he was to spend his life
kicking dust behind Co steel bars.
Peace was once again restored.
A warning to all those who flirt with danger: Your evil
intention may be the initial step in a C copy life of
the saga of the Au dust kid.
END

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Great job! You have finished the activity! Now, take time to process
the information you acquired by accomplishing the next task.
Directions: On the table are some of the words you encountered during the activity. Fill in the table by
writing the corresponding letter symbols and your idea or knowledge about the given words (this can
be based on what you hear in day-to-day conversations or from advertisements on television).
Letter symbol My idea about this word
Oxygen
Chlorine
Zinc
Iron
Gold
Guide questions:
1. Are you familiar with those words? Why do you think you are familiar with them?
2. How did the special tool help you in your task earlier?
The words you have identified in the activity are called elements, and the special tool you used is
called the Periodic Table of Elements. The first lesson will teach you what elements are and how
they are represented in Chemistry.

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The elements are the simplest form of matter. From elements, more complex substances
are formed and hence form everything around us. Being the simplest form of matter, elements can
no longer be broken down into smaller components physically or chemically. Do you think water
can still be broken down into smaller components? Yes, it still can. The electrolysis of water will
separate H2O into H2 and O2. (2H2O (l)  2H2 (g) + O2 (g)). But Hydrogen and Oxygen both cannot be
broken down further into smaller components. In this example, we can also see that Hydrogen and
Oxygen are the elements that makeup water. But it isn’t just water that elements form, they form
everything!
Each element is made up of one type of atom and has a set of properties unique from
another. This means that no two elements have the same set of properties. These properties and
other information about the elements are summarized in a special tool created by scientists called the
Periodic Table of Elements.
The Periodic Table lists all 118 elements
known at present. It provides information about the
elements like atomic number, atomic mass,
electronegativity, and ionization energy (You will learn
about this in the succeeding grade levels.). The
elements are arranged from left to right and top to
bottom in order of increasing atomic number.
Usually, as the atomic number increases, the atomic
mass increases, too.
Scientists used letters to represent elements to make it
easier for us to be familiar with them. These letters are called
symbols.
Symbols of elements can be one letter or two letters.
 Elements like Boron, Oxygen, and Sulfur have one letter symbol taken from their first
letters. (Boron = B, Oxygen = O, Sulfur = S).
 Other symbols are taken from the first two letters of the element name. Like Li for
Lithium, Co for Cobalt and Ca for Calcium.
 There are also two-letter symbols which consist of the first letter of the element followed
by another letter found in the element name. Examples of these are: Chlorine = Cl,
Zinc = Zn, and Cadmium = Cd.

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Thus, usually an element symbol is one letter only, that is the first letter of the element name, or
two letters which consist of the first letter and another letter found in the element name. However,
there are also elements that have peculiar symbols like Iron whose symbol is Fe. It is because some
symbols of the elements are taken from their ancient names. Iron has an ancient name of
ferrum, hence the symbol Fe. Below is a table that shows the ancient names of some elements and
their symbols.
Elements with Ancient Names
Ancient name Element Symbol
Argentum Silver Ag
Aurum Gold Au
Cuprum Copper Cu
Ferrum Iron Fe
Hydrargyrum Mercury Hg
Kalium Potassium K
Natrium Sodium Na
Plumbum Lead Pb
Stannum Tin Sn
Stibium Antimony Sb
Wolfram Tungsten W
Remember: Element symbols always start with a big letter followed by a small letter (in
case of two-letter symbols).
Do you understand now what elements are and how they are represented? Do you think you
can use the Periodic Table to identify the names and symbols of elements? Let us find out in the
succeeding activity.

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I - Directions: Write the
symbol of the given
elements. (You may
refer to the periodic
table)
1. Beryllium
2. Cobalt
3. Carbon
4. Iodine
5. Neon
6. Silver
7. Lead
8. Polonium
9. Yttrium
10. Radon
11. Astatine
12. Phosphorus
13. Platinum
14. Ruthenium
15. Tin
II - Write the name of the following element symbols. (You may refer to the periodic table)
1. Cl
2. Ar
3. F
4. Cu
5. Fe
6. W
7. Xe
8. Mo
9. Ru
10. Mg
11. Zn
12. As
13. S
14. V
15. Mn
III - Directions: The following are words consist of symbols of different elements. Name the
elements that make up these words. Example: PLaCe = Phosphorus, Lanthanum, Cerium. You
may refer to the periodic table.
A - Average
1. YOU
2. KNIFe
3. ClOCK
4. CaNDy
5. POISON
6. WAtCH
7. VIRuS
8. TeAm
9. HYMn
10. FIRe
If you think you got it now, proceed with the following words.
B - Advanced
1. MoUNTaIn
2. AlCoHOLiC
3. AmErICaN
4. ArGeNTiNa
5. AsPIrIn
6. CYClONe
7. DyNAmITe
8. PIRaTe
9. SiCKNeSS
10. VIRuS

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LET’S GET ORGANIZED!
Directions:
1. Look for five (5) objects at home that seem to be scattered or disorganized.
2. Pick them up and organize them.
3. List at least three (3) objects that you find close to the object you picked up after
organizing them.
4. Fill out the table.
Objects I picked up Objects I placed them with
Example: spoon Fork, plates, knives
1. What was your basis in putting together those objects you picked up?
2. Is it organized to do so? Why?

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Over the years, scientists have discovered plenty of information about the elements and
finding a way of organizing them had been a difficult task. Until the periodic table of elements was
proposed by Dmitri Mendeleev. Now, elements are arranged in such a way that their location in the
periodic table can tell us information about their behavior or properties. Find out more about this in the
succeeding section.
Scientists logically arranged the elements in the periodic
table. Doing so allowed us to have an idea about the properties of
some elements by knowing the properties of other elements related
to them. Thus, knowing where an element is located in the periodic
table can give us information about its properties. This means that
there is no need to memorize the periodic table, but it is an
advantage to be familiar with it.
The columns of elements in the periodic table are called
family or group. These columns are numbered 1 to 18 from left to
right. Each family or group has a corresponding group number. For
example, the first column is called Group 1, the second column,
Group 2 and so on. Elements found in the same column in the
periodic table have similar
properties. Therefore, Oxygen and Sulfur, which are group 16 elements have similar properties with
Selenium, Tellurium, Polonium and Livermorium.
ODD ONE OUT
Directions: Write the name of the element which does not belong to the group/family.
1. Germanium, Lead, Polonium, Carbon
2. Strontium, Arsenic, Bismuth, Phosphorus
3. Neon, Osmium, Xenon, Krypton
4. Barium, Iodine, Fluorine, Chlorine
5. Calcium, Magnesium, Radium, Zinc

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To strengthen what you have learned in this module, perform the following additional tasks.
1. Watch this video of the periodic table song. https://youtu.be/rz4Dd1I_fX0
2. Using the word ELEMENTS, make an acrostic about the things you learned in today’s lesson.
(An acrostic is a short poem that uses the letters of the given word as the first letter of the lines
in the poem).
Example acrostic “Gold”
G-Gold is one element I truly know
O-Older than my great great grandparents, lo! L-Listed
among the others in the periodic table D-Dear to those
who love gems and jewels
Congratulations on finishing the supplementary
learning module! You have just had an amazing learning
journey, and for sure, you will have the same in the
succeeding modules.
This time, share to the class your final insights
by completing the following sentence prompts.
,

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The following terms used in this module are defined as follows:
Atomic Number – the number of protons in an atom
Atomic Mass – the amount of matter contained in an atom of an element.
Elements – are chemically the simplest substance and hence cannot be broken down using chemical
reactions.
Group/Family – the columns in the periodic table that are numbered 1 to 18 from left to right.
Periodic Table of Elements – the organized array of all the chemical elements in order of increasing
atomic number.
Symbol – (chemical symbol) a short notation derived from the name of a chemical element.
Directions: Give what is asked or described in each item by writing the letter of the correct answer. (You
may refer to the periodic table).
1. What element has the symbol Cl?
a. Carbon
b. Calcium
c. Chlorine
d. Cobalt
2 Which of the following elements belong to group 1?
a. Neon
b. Iodine
c. Lithium
d. Potassium
3. How many elements are there in the Periodic Table?
a. 201
b. 192
c. 118
d. 100
4. The following elements belong to the same group, EXCEPT ONE. Which element is it?
a. Zinc
b. Radium
c. Calcium
d. Magnesium
5. Which of the following is the symbol of Sulfur?
a. S
b. Si
c. Sr
d. Sc