Nuclear model of the atom

Nuclear Model of the Atom Worksheet

Use the interactive animation of the nuclear model found at https://chemicalformula.org/atom

to complete the following. 1 mark each unless otherwise indicated.

1. What three sub atomic particles are found in an atom?

2. Where is the nucleus found in an atom?

3. What sub atomic particle orbits the nucleus of an atom?

4. What charge is an electron?

5. Complete the sentence. Atoms are made mostly of ___________ _____________

6. What two sub atomic particles that are found in the nucleus of an atom?

7. What charge is the nucleus of an atom?

8. What is the number of protons in an atom called?

9. What is the Atomic Number of Helium?

10. What sub atomic particle helps make the nucleus stable?

11. What is the relationship between the number of protons and the number of electrons in an atom?

12. Complete the table. 6 marks

Sub atomic particle	Charge	Relative mass	More information. Complete
Proton		1800	The number of protons in the nucleus determines what ______________ it is.
Neutron		1801	Neutrons help _______________ the nucleus.
Electron		1	The outer electrons are involved in chemical ______________

13. Draw an diagram of an atom of Helium. Include the electrons, protons and neutrons. 3 marks.

1 mark for the correct number of particles.

1 mark for the correct position of the particles.

1 mark for including a labelled diagram

14. What is the Mass Number of an atom?

15. What is the Mass Number of Helium?

16. What is an isotope?

17. What causes an unstable nucleus?

18. What type of isotope releases nuclear radiation from its nucleus?