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Chapter: 7th Science : Term 1 Unit 4 : Atomic Structure

Points to remember

7th Science : Term 1 Unit 4 : Atomic Structure : Points to remember

Points to remember

* An atom is the smallest particle of a chemical element that retains its chemical properties.

* They are very tiny compared to other particles.

*  Atoms are too small to be seen by the naked eye or even through microscope.

* An atom consists mostly of empty space.

* Atoms of same element are identical, and different elements differ.

* An atom consists of a dense nucleus of positively-charged protons and electrically-neutral neutrons.

* The protons and neutrons are called nucleons.

* The protons, neutrons and electrons are denoted by p,n,e respectively.

* An atom is electrically neutral. Atoms contain equal number of protons and electrons.

* Atomic number is the number of protons in an atom.

* The total number of protons and neutrons present in the nucleus of an atom is the mass number.

* Valency is defined as the combining capacity of an element.

 

ICT CORNER

Atomic Structure

Let’s build an atom.


PROCEDURE :

Step 1: Use the URL to reach stimulation page. Click play button to launch the simulation.

Step 2: Click on the”ATOM” , a new window will be open. Drag the particles (Protons, Neutrons and Electrons) from the baskets which is at the bottom of the display.

Step 3: You can observe the changes in ‘Elements, Net charge and Mass number’ at the right side windows.

Step 4: Click on the ‘Symbol” at the bottom. Drag the particles and get the Symbol of the element.

Step 5: Click on the”GAME” and play the games.


Atomic Structure URL:

https://phet.colorado.edu/en/simulation/build-an-atom

*Pictures are indicative only

*If browser requires, allow Flash Player or Java Script to load the page.


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