ATOMIC STRUCTURE- SUB-ATOMIC PARTICLES WITH ATOMIC AND MASS NUMBER

1. DIGITAL LESSON PLAN
LEVEL- I
SCIENCE
BY
K.LEENA VIOLET

2. IDENTIFY THE STATES OF MATTER

3. 1.WHAT DO YOU OBSERVE FROM THIS PICTURE?
2. SOLAR SYSTEM CAN BE COMPARED WITH-----

4. ATOMIC STRUCTURE
ATOM: THE SMALLEST PARTICLE OF AN MATTER
THAT CANNOT BE SEEN WITH NAKED EYES.

5. SUB-ATOMIC PARTICLES
• There are 3 sub-atomic particles they are;
1. Protons
2. Electrons
3. Neutrons

6. SUB-ATOMIC PARTICLES
1. Protons - They are present inside the nucleus of an
atom and they possess positive charge in nature.
They are denoted by letter (p).
2. Neutrons – They are also present inside the nucleus
of an atom and they possess no charge or neutral in
nature. They are denoted by (n).
3. Electrons –They revolve around the nucleus of an
atom in the orbits or shells. They are negatively
charged in nature and denoted by letter (e).
4. Note- protons and neutrons together called to be as
nucleons.

7. ATOMIC NUMBER
• The atomic number is defined as the total number of protons that is present
inside the nucleus of an atom.
• It is denoted by symbol ( Z)
Example- boron has 5 protons and hence its atomic number is 5

8. MASS NUMBER
• Mass number is defined as the total number of protons and number of neutrons
present in the nucleus of an atom.
• It is denoted by symbol (A).
• Example- lithium atom has 4 neutrons and 3 protons and hence its mass number is
7
• A= p+ n

9. APPLICATIONS
• It is used to give the properties of various elements
• The elements are arranged in increasing order in periodic based upon the
atomic number.
• Mass number is used for general purposes
• It is accurate without any decimals

10. SUPERVISION
• Calculate the mass number and atomic number of oxygen atom

11. SUMMARIZATION
• Relates structure of atom
• Sub-atomic particles
• Protons, electrons and neutrons with its charges and symbols.
• Calculation of atomic number and mass number.

12. ASSIGNMENT
1. Find the atomic number for beryllium atom if its protons number is 4 and
electrons number is 4.
2. Find the mass number for carbon atom if its protons number is 6 and neutrons
number is 6.