1 Which of the following is NOT a property of isotopes? A They have the same atomic number B They have different mass numbers C They have identical chemical properties D They have the same number of neutrons
2 The relative atomic mass of an element is calculated by comparing the mass of its atom with the mass of: A Carbon-12 atom B Hydrogen-1 atom C Oxygen-16 atom D Nitrogen-14 atom
3 The instrument used to determine the relative atomic masses of isotopes is called a: A spectrometer B mass spectrometer C calorimeter D chromatograph
5 The proton was discovered by which scientist? A J. J. Thomson B E. Goldstein C James Chadwick D Neil Bohr
6 The positively charged particles produced in a discharge tube were named protons by: A Eugene Goldstein B J. J. Thomson C James Chadwick D John Dalton
7 Which instrument is used to determine the accurate mass of isotopes and their relative abundance? A Cathode ray tube B Mass spectrometer C Gold foil apparatus D Discharge tube
8 Which instrument is used to determine the relative atomic masses of isotopes? A Spectrometer B Mass spectrometer C Calorimeter D Chromatograph
9 Which of the following is an isotope of hydrogen? A Carbon-12 B Chlorine-35 C Deuterium D Oxygen-16
11 The mass number (A) of an atom is equal to: A Number of protons B Number of neutrons C Number of protons + neutrons D Number of electrons
12 Isotopes of an element have the same number of protons but different number of: A Electrons B Neutrons C Orbits D Ions
13 The relative atomic mass of an element is the: A sum of masses of all isotopes B weighted average of the masses of its isotopes C mass of the most abundant isotope D mass of the lightest isotope
14 The relative atomic mass of an element is calculated with reference to which standard? A Carbon-12 B Hydrogen-1 C Oxygen-16 D Chlorine-35
15 Which subatomic particle was discovered by J. J. Thomson through his experiments with cathode rays? A Neutron B Electron C Proton D Nucleus
16 Which isotope of hydrogen has one proton and two neutrons? A Protium B Deuterium C Tritium D Carbon-12
17 For an atom of carbon with symbol 12/6 C, the atomic number (Z) and number of electrons are: A 12 and 12 B 6 and 12 C 12 and 6 D 6 and 6
18 The discovery of the proton is attributed to: A J.J. Thomson B E. Goldstein C James Chadwick D John Dalton
19 The mass spectrometer is used to determine: A Atomic number B Relative atomic masses of isotopes C Number of electrons D Chemical bonding
20 In a mass spectrometer, ions are separated based on their: A Charge only B Mass only C Mass-to-charge ratio (m/e) D Color
21 Which instrument is used to determine the mass of isotopes? A Spectrometer B Mass spectrometer C Calorimeter D Microscope
24 Isotopes of an element have the same number of: A Neutrons B Protons but different neutrons C Nucleons D Neutrons and electrons
25 The isotope used in the treatment of cancer is: A Cobalt-60 B Carbon-14 C Chlorine-35 D Hydrogen-1