AS & A Level Chemistry 1.1 Particles in the atom and atomic radius : Exam Style Questions Paper 1 A Level PhysicsA Level MathsA Level ChemistryA Level Biology A Level Chemistry Paper 1 - All Chapters Question Which diagram shows the variation of the metallic radius r of the Group I elements, Li, Na, K and Rb, with increasing proton (atomic) number?Answer/ExplanationAns:A Question John Dalton’s atomic theory, published in 1808, contained four predictions about atoms. Which of his predictions is still considered to be correct?All atoms are very small in size.All the atoms of a particular element have the same mass.All the atoms of one element are different in mass from all the atoms of other elements.No atom can be split into simpler parts.Answer/ExplanationAns:A