Atomic structure

• Science
• Secondary Education

SCIENCE 

GRADE-9

FEB 1, 2021

MS.FAMIN

RULES - SEMESTER 2

1. Everyday participation will be marked and the the list can be found in files of Science team

2. All the links should be joined before the class

3. Active participation is required from everybody 

• launch lab 

1. Take a paper 
2. Start tearing the paper
3. Continue tearing the paper till you cannot proceed

• OBJECTIVES 

1. Describe the characteristics of subatomic particles

2. Examine the nature of isotopes

ELECTRON 

NUCLEUS 

PROTONS 

ELECTRONS

NEUTRONS 

NO CHARGE 

POSITIVE CHARGE

NEGATIVE CHARGE 

Calculate the number of protons, neutrons and electrons in an atom of oxygen

If the abundance of three isotopes of oxygen are oxygen -16 is 99.7 %, oxygen -17 is 0.38 % and oxygen-18 is 0.20 % what is the average atomic mass of oxygen?

1. 18
2. 17
3. 16
4. 17.5

Using the abundance of lithium isotope predict the atomic mass of lithium atom

1. 6.94
2. 8.0
3. 5.50
4. 7.93

A sample of copper contains 69.17 % Cu-63 and 30.83 % of Cu-65. What is the average atomic mass of copper?

Nitrogen contains 99.63 % N-14 and 0.37 % N-15. What is the average atomic mass of nitrogen

OBJECTIVE CHECK

1. Describe the characteristics of subatomic particles

2. Examine the nature of isotopes

Thoughts about today''s lesson