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Natural sciences

Grade 8

Matter: classification

Module 17


  • We have already mentioned the fact that atoms are the smallest particles in the composition of matter.

But what is the size of an atom and what is it like?

  • The diameter of an atom is 0,000 000 001m – which is one millionth of a millimetre!
  • When you inflate a balloon, which then seems to contain nothing, you need to consider that it will contain approximately one billion gas atoms (100 000 000 000 000 000 000)!
  • One cubic millimetre of table salt (as much as will cover the head of a pin) will contain approximately 70 million atoms!
  • If each of the atoms in a grain of sand were the size of the head of a pin, the grain of sand would have a diameter of two kilometres!
  • Atoms are rightfully regarded as the building blocks of matter, but there also are subatomic particles, which we know as Protons, Neutrons and Electrons .

Ask your educator for help with drawing the atoms of hydrogen and of oxygen:

Class project

POSTER – Scientists through the ages

  • Gather information about scientists like Ernest Rutherford (1911) and Neils Bohr (1913) and their contribution to present-day knowledge of atoms.
  • Collect pictures and bring the information you have gathered to the class.
  • Work together as groups to produce a poster dealing with scientists through the ages . We’ll be adding other names to the list as we work through the module.

Assessment of class project

Did you collect the information and assemble the poster, honouring scientists through the ages for their efforts?

[LO 1.1; LO 1.2; LO 1.3; LO 3.1]

 Do you know the following? 

There are subatomic particles known as muons, gluons, and gravitons!

There are particles that are smaller than electrons known as quarks and leptons.

Quarks have strange names, like: up , down , strange , as well as up and down

Read more about these strange things, which are the smallest known particles.



Learning outcomes 1: Scientific investigations

The learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts.

We know this when the learner:

  • is able to plan investigations;
  • is able to execute an investigation and collect data;
  • is able to evaluate data and communicate findings.

Learning outcomes 3 : Science, society and the environment

The learner will be able to demonstrate an understanding of the interrelationships between science and technology, society and the environment.

We know this when the learner:

3.1 is able to show appreciation of science as a human endeavour.



Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Mueller Reply
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Source:  OpenStax, Natural sciences grade 8. OpenStax CNX. Sep 12, 2009 Download for free at http://cnx.org/content/col11050/1.1
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