Paper 1 May/June 2013 CHEMISTRY (9701/11) IGCSE

Three statements about potassium and chlorine and their ions are listed.
1 The atomic radius of a potassium atom is greater than the atomic radius of a chlorine atom.
2 The first ionisation energy of potassium is greater than the first ionisation energy of chlorine.
3 The ionic radius of a potassium ion is greater than the ionic radius of a chloride ion.
Which statements are correct?