Points to Remember, Glossary, Concept Map

Points to Remember

• An atom consists of elementary particles like proton, electron and neutron.

• The discharge tube used in the experiment is now referred as Crookes tube or Cathode Ray Tube (CRT). It is a long glass tube filled with gas and sealed at both the ends.

• Different atoms have different combining capacities. The combining capacity of an atom is known as its valency.

• Chemical formula is the short hand notation of a molecule of a substance (compound) . It shows the actual number of atoms of each element in a molecule of a substance.

• In naming a compound containing a metal and a non-metal, the name of the metal is written first and the name of the non-metal is obtained by adding the suffix-ide to its name.

• Balancing chemical equation is necessary, so that law of conservation of mass may be obeyed.

• The law of conservation of mass states that during any chemical change, the total mass of the products is equal to the total mass of the reactants.

GLOSSARY

1. Anode The positively charged electrode or an electron acceptor.

2. Cathode The negatively charged electrode or an electron donor.

3. Chemical formula It is a representation of a substance using symbols for its constituent elements.

4. Discharge tube A tube containing charged electrodes and filled with a gas in which ionisation is induced by an electric field.

5. Ion An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

6. Molecular formula It is a formula giving the number of atoms of each of the elements present in one molecule of a specific compound.

7. Precipitate An insoluble solid that emerges from a liquid solution.

8. Product A substance that is formed as the result of a chemical reaction.

9. Reactant A substance that takes part in and undergoes change during a reaction.

10. Valency The combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.

Concept Map

REFERENCE BOOKS

1. Petrucci, Ralph H et.al. General Chemistry: Principles & Modern Applications (9th Edition). Upper Saddle River, NJ: Pearson Prentice Hall, 2007. Print.

2. P.L.Soni, Text book of Inorganic Chemistry,S. Chand publication, New Delhi

3. Complete Chemistry (IGCSE), Oxford university press, New York

4. Raymond Chang. (2010).Chemistry. New York, NY: The Tata McGraw Hill Companies. Inc.

5. Frank New Certificate Chemistry. McMillan Publishers

INTERNET RESOURCES

1. https://www.chem4kids.com

2. https://courses.lumenlearning.com/ boundless - chemistr y/chapter/the - structure-of-the-atom/

3. https://www.khanacademy.org/science/ biology/chemistry--of-life/elements-and-atoms/e/atomic-structure

 ICT CORNER

ATOMIC STRUCTURE

Through this activity you will learn the atomic structure through Interactive games

Step 1

• Open the Browser and type the URL given below.

• You can see Protons Neutrons and Electrons Atom games.

• Click the first game, you will see the periodic table. Start the quiz and answer it.

• Likewise explore the next game and play it.

URL:

https://www.wartgames.com/themes/science/atomicstructure.html