1. Which particles have the same mass?

2. This question is about the structure of atoms. Choose words from the list to complete the sentences below. electrons ions neutrons protons In an atom, the particles with a negative charge are called ..................................... Particles in the nucleus with no charge are called ..................................................... An atom has no overall charge because it has the same number of electrons and .............................

3. Chlorine is present as two isotopes. Calculate its relative atomic mass, with the following information. You must show your working. Cl (35) 76% Cl (37) 24%

4. How many protons, neutrons and electrons does calcium have? Its mass number is 40 and the atomic number is 20

5. An atom has atomic number 8 and mass number 18. How many protons, neutron and electrons does this atom contain?

6. An atom of aluminum has a relative atomic mass of 27 and a atomic number of 13. What is its number of protons neutrons and electrons?

7. What does the big number by each element represent in the periodic table

8. Name two metals in period 4.

9. Explain the differences between relative atomic mass, mass number and atomic number.

10. Why are gold rings not 100% gold?

11. An atom has an electronic configuration of 2,1. Explain which group of the periodic table this atom belongs to.

12. An atom has an electronic configuration of 2,1. Name the element which is made up of this type of atom.

13. What name is given to a horizontal row of elements in the periodic table.

14. State one similarity and one difference between the electronic configurations of Sodium and Potassium.

15. Calcium reacts with chlorine to form the ionic compound calcium chloride. Describe, in terms of electrons, how an atom of calcium reacts with two chlorine atoms to form calcium chloride.

16. Atom X has 31 protons and is in group 3, period 4. Atom Z is in group 5, period 4. Explain how many protons Atom Z has.

17. How many protons, neutrons and electrons does magnesium have? Its mass number is 24 and the atomic number is 12

18. If there are 6 protons in the nucleus of an atom, how many electrons are in the atom? (1 mark)

19. Why do elements in the same group have similar chemical properties?

20. Which element has the electronic configuration 2.8.6?

21. 2 isotopes of carbon are C12 and C14. What is the number of neutrons that they both have? What is the number of protons that they both have?

22. How many protons, neutrons and electrons does Bromine have? Its mass number is 80 and the atomic number is 35

23. Atom X is in group 3. How many electrons does it have in its outer shell?

24. What is the relation between periods and number of shells in an atom.

25. Which element has the atomic number of 6?