Describe how the plum pudding model of the atom was replaced by the nuclear model.
From Paper 9 (Chemistry), Higher
73 marks
An atom of potassium has mass number 39 and atomic number 19. Give the numbers of protons, neutrons and electrons.
From Paper 9 (Chemistry), Higher
132 marks
An element has two isotopes: mass 35 (75%) and mass 37 (25%). Calculate its relative atomic mass.
From Paper 9 (Chemistry), Higher
192 marks
An element has two isotopes: mass 63 (69%) and mass 65 (31%). Calculate its relative atomic mass.
Score 0 / 10 · 0 of 4 marked
This paper is written by Plasmo in the style of the OCR GCSE Combined Science exam. It is not a past paper and is not produced or endorsed by the exam board.