What is the approximate radius of an atom?10-6 m10-12 m10-10 m10-8 m2Which two types of particles may be found in the nucleus of an atom?Alpha particles and neutronsProtons and electronsNeutrons and electronsProtons and neutrons3What is the approximate ratio of the mass of the proton to that of the electron (how many times larger is the mass of a proton than that of an electron)?181,80018,0001804What must happen for a neutral atom to be ionised?It must undergo a chemical reaction with another particleIt must gain or lose electronsIt must gain or lose neutronsIt must gain or lose protons5Which of the following statements is correct?The isotopes of an element contain the same number of protons but different numbers of neutronsThe isotopes of an element contain the same number of electrons but different numbers of protonsThe isotopes of an element contain the same number of protons but different numbers of electronsThe isotopes of an element contain the same number of neutrons but different numbers of protons6The nucleus of potassium-40 atom contains 19 protons.  How many neutrons does it contain?402119207Carbon-12 contains 6 protons and 6 neutrons in its nucleus.  Which of the below is NOT an isotope of carbon?An atom which has 5 protons and 6 neutrons in its nucleusAn atom which has 6 protons and 7 neutrons in its nucleusAn atom which has 6 protons and 8 neutrons in its nucleusAn atom which has 6 protons and 5 neutrons in its nucleus8What does the mass number of a nucleus tell us?Its mass (in kilograms)The number of neutrons which it containsThe total number of protons and neutrons which it containsThe number of protons which it contains