3.4.2 Atomic structure part 2

• Science
• Secondary Education

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

Mass percentages.
What is the mass percentage of carbon in:

C​11​​H​22​​O​11​​

Thoughts about today's lesson

Now go and do the exercises of paragraph 3.4