Constituents of the atom and isotopesAQA A-Level Physics: Mind map

Exam questions on Constituents of the atom and isotopes

1. A student studies the structure of lithium. A neutral atom of lithium-7 is written $^{7}_{3}\mathrm{Li}$. Use e = 1.60×10⁻¹⁹ C.
   Another isotope of lithium is $^{6}_{3}\mathrm{Li}$. State the number of protons, neutrons and electrons in a neutral atom of this isotope.2 marks
2. Chlorine, proton number 17, occurs naturally as two stable isotopes, chlorine-35 and chlorine-37. In sodium chloride chlorine forms chloride ions, Cl⁻.
   State one way in which atoms of chlorine-35 and chlorine-37 are the same and one way in which they differ, in terms of particles.2 marks
3. Naturally occurring chlorine consists of 75.8% chlorine-35 and 24.2% chlorine-37 by number of atoms. Use e = 1.60×10⁻¹⁹ C and take the mass of a nucleus to be the number of nucleons multiplied by 1.67×10⁻²⁷ kg.
   Calculate the relative atomic mass of naturally occurring chlorine.3 marks