1. 2. What are isotopes? Use two particles from the table above to illustrate your answer. (3 marks) 17 O & 18 O (1) Same Atomic mass / number of protons (1) Different Mass Number / number of neutrons (1)

2. 3.State the difference, if any, in the chemical properties of isotopes of the same element. Explain your answer (2 marks) Chemical properties the same (1) Same number of protons & electrons (1)

3. 4. An atom of element X has two more protons and two more neutrons than an atom of 34 16 S. Give the symbol, including mass number and atomic number for this atom of X (2 marks) 38 18 Ar

4. 5. An atom of element contains the same number of neutrons as are found in an atom of 27 Al. An atom of Q also contains 14 protons. Give the number of protons in an atom of 27 Al. 13 (1) Deduce the symbol, including mass & Atomic numbers for this atom of Q 28 14 Si