The document provides information about the periodic table, including its development and structure. It discusses how elements are arranged in rows and columns called periods and groups. The main groups discussed are the alkali metals, alkaline earth metals, boron family, carbon family, nitrogen family, oxygen family, halogens, noble gases, and transition metals. It also notes the location of metals on the left side and nonmetals on the right, separated by a zigzag line.
The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic number.
This PowerPoint shows all lessons in grade-8 science. This lesson covers on topics about scientist who made great contribution in the development of the periodic table, groups and periods of the elements, and periodic trends.
If all the elements are arranged in the order of their atomic weights, a periodic repetition of properties is obtained. This is expressed by the law of periodicity.— Dmitry Ivanovich Mendeleev
Classification of Elements: The electronic structure of the atom and the Modern Periodic Table
and Periodic Law. Variation of properties within period and groups. Usefulness and limitations of
Periodic Table.
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The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic number.
This PowerPoint shows all lessons in grade-8 science. This lesson covers on topics about scientist who made great contribution in the development of the periodic table, groups and periods of the elements, and periodic trends.
If all the elements are arranged in the order of their atomic weights, a periodic repetition of properties is obtained. This is expressed by the law of periodicity.— Dmitry Ivanovich Mendeleev
Classification of Elements: The electronic structure of the atom and the Modern Periodic Table
and Periodic Law. Variation of properties within period and groups. Usefulness and limitations of
Periodic Table.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
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2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
ESC Beyond Borders _From EU to You_ InfoPack general.pdf
Periodic-Table.pptx
1.
2. Organic Chemistry II
Organic chemistry provides the student
with the necessary background to
understand the chemistry of carbon-
containing compounds
Students registering for CHEM 221 must
have a good background in general
chemistry.
4. Modern Periodic Table
A number of scientists
attempted to improve
Mendeleev’s periodic table.
Credit cannot be given to any
single person because a lot of
scientists worked hand in hand
in perfecting this table.
5. Periodic Table
It gives us a lot of information
about an element
It also gives us an idea as to why
an element is grouped together
with other elements or why it is
located at a specific spot in the
Periodic Table.
6. Chemical Symbols
Jons Jakob Berzelius (1779-1848)
- A Swedish chemist, was the first to use
letters or symbols for the elements.
(Note: in some cases, the symbol of an element
is the first letter of its name.
*In many cases, a second letter is added to
the first in order to distinguish between
elements whose names begin with the same
letter. E.g. C stands for carbon and Ca stands
for calcium.
*Some of the symbols are based on the latin
names of the elements.)
7. What is the significance of a
symbol?
A symbol as used in chemistry, is more than
an abbreviation. It tells us three things:
a. The name of the element
b. Atom of the element
c. Atomic mass of the element.
e.g.
Cl means ( a. the element chlorine; b. one
atom of chlorine; c. 35 amu of chlorine)
8. A Periodic Table has columns ( vertical
list) and rows (horizontal list). The
columns are referred to as family or
group while the rows are called periods.
1. How many families are shown in the
periodic table?
2. How many periods are shown in the
periodic table?
10. Families of Elements in the
Modern Periodic Table
How do we describe a Periodic table?
What are the groups and why they are
named as such?
a. The elements are arranged in the order
of increasing atomic numbers from left
to right and from top to bottom.
b. The groups of elements are classified
further into the following main
categories of elements:
11. 1). GROUP IA to VIIA (Main Group or
representative Elements)
a. Group IA elements – Alkali metals bec. these
elements are highly reactive metals
b. Group IIA elements- Alkaline earth metals
(chemically reactive metals)
c. Group IIIA- Boron Family
• boron- has a low electrical conductivity
• Aluminum- most abundant metal of the earth’s
crust. Alum or tawas, one of the compounds of
aluminum.
12. d. Group IVA, the carbon Family (is found
in all living things)
e. Group VA, the nitrogen family (it
dilutes the oxygen in the air and prevents
combustion and respiration taking place
rapidly.)
f. Group VIA, The oxygen Family
( it exists in two allotropic forms)
g. Group VIIA are all nonmetals.
They are known as halogens, meaning salt
former.
13. 2. Group VIIIA or O (Noble or Inert Gases)
-these elements are gases which are highly
stable because of their closed or complete
electronic configuration. They do not form
any compound.
3. Group B Elements (Transition Metals)
-the members of this group are all metals
which include familiar elements like iron and
chromium etc.
14. Two Special Groups
Lanthanoides or Lanthanide
series is composed of elements
with atomic numbers 57 to 71,
Actinoides or Actinide series is
composed of radioactive elements
with atomic numbers 89 to 103.
15. C. Metals are found on the left side of the
periodic table and are shown in blue color
while nonmetals, in orange color, are on the
right side. They are separated by a heavy zigzag
line starting between boron and aluminum
polonium and astatine. They are shown in red
color.
D. The elements along the border line between
he metals and non-metals also show
intermediate properties and are called
metalloids or amphoteric elements.
16. Important Elements in
Environment and Industry
Hydrogen- is the lightest element and is
sometimes used to fly balloons.
Nitrogen- unreactive gas and abundant in the
atmosphere.
Carbon in activated charcoal has an adsorbent
property of attracting and holding materials to
its surface. This makes it a good purifier to
remove color and odor from certain gases and
liquids. It is also used in gas mask to inhale air
that is free from air pollution.
17. Iron, because of its metallic property, it
is widely used in industry.
Copper has a very good conductivity.
It is, therefore, widely used as electric
wirings.
Oxygen supports combustions and is
used in torches for welding.