Science grade 09 Lesson1-2 NLC-pptx.pptx

In our class we will;
 Do our best
 Listen
 Have fun!
 Participate
 Ask questions

NIELS HENRIK DAVID BOHR
- was a Danish physicist who made
foundational contributions to
Science, for which he received
the Nobel Prize in Physics in
1922.
- Bohr developed the Bohr model of
the atom,

• The center of the atom is called the nucleus.
• The other important particles are electrons, and
they are in orbits known as energy shells around
the nucleus.

Component 1: Short Review
Q1. According to Bohr’s atomic model, what is
the structure called at the center of the atom?
Q2. What are the particles inside the center
called?
Q3. What other particles are important in an
atom and where are they located?

Short Overview
Q1. According to Bohr’s atomic
model, what is the structure
called at the center of the
atom?
The center of the atom is called
the nucleus.

Short Overview
Q2. What are the
particles inside the
center called?
The particles inside the center are
protons and neutrons.

Short Overview
Q3. What other particles
are important in an atom
and where are they
located?
The other important particles
are electrons, and they are in
orbits known as energy shells
around the
nucleus.

Lesson Purpose and Intention
 This lesson is about a model of the
structure of the atom as described by
Niels Bohr and the limits of that
structure.
 The lesson may also help you understand
that scientists sometimes draw diagrams
and use models to represent what cannot
be seen with the naked eye.

Keywords/terms:
orbit;
protons;
neutrons;
valency

• Atoms are the
smallest particles of
matter
• Atoms make up
everything around
us

Science grade 09 Lesson1-2 NLC-pptx.pptx

Match each scientific term with its correct definition by
drawing a line to connect their boxes.

Match each scientific term with its correct definition by drawing a line to connect
their boxes.
Answers:

Component 4: Lesson Activity Component 4A
The main lesson stimulus includes symbolic representations of the structure of atoms as
well as two short paragraphs of text.
The Bohr Model of an atom of Carbon
Jose is in Grade 9. One day he said
to his parents that his teacher had
been talking about the structure of
the atom in class, so he decided to
research what he could find out for
himself. He put together the
following paragraph from several
sources.

Component 4B
Q1. How many protons are there in the diagram?
Q2. What is the name of the type of particle
labeled Y, and how many are there in the
diagram and what charge do they carry?
Q3. What is the name of the type of particle labeled Z,
and why are there the same number as there are
protons in the diagram, and what charge do they
carry?

Component 4B
Q1. How many protons are there in the diagram?
There are 6 protons in the nucleus.
labeled Y, and how many are there in the
diagram and what charge do they carry?
The particles labeled Y are neutrons, there
are 6 of them and they carry no charge.

Component 4B
labeled Z, and why are there the same
number as there are protons in the
diagram, and what charge do they carry?
The particles labelled Z are electrons and
there are 6 in orbit around the nucleus,
and they carry a negative charge, resulting
in the atom being neutral in charge.

The Bohr Model of an atom of Carbon
Niels Bohr
In 1913, Niels Bohr proposed a model for the structure of an atom based on the work
of Ernest Rutherford about the nucleus of atoms and Max Planck’s quantum theory.
Bohr suggested that the central heavy positive nucleus contains protons and neutrons
and that the negatively charged electrons moved around the nucleus in circular paths
called orbits. Although Bohr’s model is inaccurate in terms of the electron energy
levels or shells it is still used today as an introduction to the Atomic Theory. The
Quantum Mechanical Model of the Atom is currently accepted as more accurate. The
symbols used in chemistry for the subatomic particles are neutrons no, protons p+,
electrons e-.

Component 4C
Q1. Bohr based his theories of the structure of an atom on two
other scientists. Name the two scientists.
 The two scientists on whose work Niels Bohr based his own atomic theory
were Ernest Rutherford and Max Planck.
Q2. What is the electron configuration for an atom of Carbon?
 The electron configuration
for an atom of Carbon is
represented as

Question 1:
Has this lesson helped you to
better understand what an
atom is? If so, how?

Question 2:
Which questions were easy to
answer – the ones in
Component 4B or Component
4C? Why?

• all the atoms of all the elements are not same.
LIKE helium
• The overall charge of an atom is neutral.

Component 1: Short Review
Q1. What is the overall charge of an atom?
Q2. What are the positive particles in an atom called and
what are the negative particles called?
Q3. Are all the atoms of all the elements the same? Give
examples?

Short Overview
Q1. What is the overall
charge of an atom?
The overall charge of an atom is
neutral.

Short Overview
Q2. What are the positive
particles in an atom called
and what are the negative
particles called?
The positive particles are
protons, and the negative
particles are electrons.

Short Overview
Q3. Are all the atoms of all
the elements the same?
Give examples?
No, all the atoms of all the
elements are different, that is
the atoms of hydrogen are
different from
the atoms of oxygen or the
atoms of carbon etc.

Lesson Purpose and Intention
 This lesson is about how atoms of one
element are different from the atoms of
another element.
 The lesson may also help learners to
better understand the concept of
elements and compounds.

Lesson Language
Practice
• Aluminum;
• Carbon;
• Lead

- Look carefully at the pictures above and see how one object
differs from the others.
- Each of these objects is made from a different element. Some are
shiny, some have color, some are hard, and some are soft.
- The reason they have different properties is that their atoms are
slightly different, they have different number of protons in their
nucleus and therefore different numbers of electrons in orbits
around the nucleus.

● GOLD is a metal that has an atomic
number of __? and is used to make
jewelry and other precious items.
● LEAD is a metal with atomic number
__?, it is not very shiny and it is used
for weights, in batteries and paint.

● Carbon is a non-metal with atomic
number __? and occurs in nature as
diamond and graphite they look very
different from one another.
● Aluminum is a shiny metal, with an
atomic number of__? and is used to
make cooking utensils and roofs on
houses.

Component 4B
Q1. Can you name one thing other than what is
in the pictures, that is often made of Gold?
Q2. Does Aluminum have more protons than
Carbon? If so, how many?
Q3. Things that are made of lead are often heavy,
can you suggest why?. How many protons are
there in the diagram?

Component 4B
answers:
1. Gold watch, chain many possible
answers.
2. Aluminum has seven more protons
than Carbon.
3. Maybe because each of its atoms has
a lot of protons in it, so then maybe
anything made of Lead
would be heavy.

Component 4C
Q1. If Magnesium has 12 protons
in its nucleus, how many electrons
does it have in orbits around it?
Q2. What are the symbols for
protons, neutrons, and electrons?

Component 4C
Q1. If Magnesium has 12 protons
in its nucleus, how many electrons
does it have in orbits around it?
It has 12 electrons in 3
electron shells.

Component 4C
Q2. What are the symbols for
protons, neutrons, and electrons?
Protons are p+
Neutrons are n◦
Electrons are e-

Question 1:
Q1. Has this lesson helped
you to better understand the
differences between atoms? If
so, how?

Science grade 09 Lesson1-2 NLC-pptx.pptx

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