Chem – Chapter 2: Atomic Structure

1

The mass number of an atom is equal to the number of:

A Protons only B Neutrons only C Protons plus electrons D Protons plus neutrons

2

The charge on a neutron is:

A +1 B -1 C Zero D +2

3

Which particle has no charge?

A Proton B Electron C Neutron D Ion

4

Which particle was discovered by Goldstein using a perforated cathode?

A Electron B Proton C Neutron D Nucleus

5

An ion of an element has the same number of protons as its neutral atom but a different number of:

A protons B neutrons C electrons D nucleons

6

Who discovered the electron through cathode ray discharge tube experiments?

A J. J. Thomson B E. Goldstein C James Chadwick D Ernest Rutherford

7

The mass number (A) of an atom is the sum of:

A Protons and electrons B Neutrons and electrons C Protons and neutrons D Electrons only

8

Which subatomic particle has no charge?

A Proton B Electron C Neutron D Ion

9

One atomic mass unit (amu) is equal to:

A 1/12 the mass of a carbon-12 atom B Mass of one proton only C Mass of one electron only D Mass of one neutron and one proton

10

The atomic number (Z) of an element is equal to the number of:

A Neutrons B Protons C Electrons + Neutrons D Nucleons

11

The isotopes of chlorine have mass numbers:

A 35 and 36 B 35 and 37 C 36 and 38 D 34 and 36

12

Which particle was discovered by James Chadwick?

A Electron B Proton C Neutron D Nucleus

13

Who discovered the electron?

A J.J. Thomson B E. Goldstein C James Chadwick D Rutherford

14

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

15

The instrument used to determine the relative atomic masses of isotopes is called a:

A spectrometer B mass spectrometer C calorimeter D chromatograph

16

The discovery of the proton is attributed to:

A J.J. Thomson B E. Goldstein C James Chadwick D John Dalton

17

Which isotope is used in the treatment of cancer?

A Cobalt-60 B Carbon-14 C Uranium-235 D Hydrogen-1

18

Which subatomic particle was discovered by J. J. Thomson through his experiments with cathode rays?

A Neutron B Electron C Proton D Nucleus

19

Which of the following is NOT a subatomic particle?

A Proton B Neutron C Electron D Molecule

20

Carbon-14 is commonly used to:

A generate electricity B determine the age of fossils C purify water D make fertilizers

21

Isotopes of an element have the same:

A Mass number B Number of neutrons C Atomic number D Relative atomic mass

22

Which particle orbits the nucleus in an atom?

A Proton B Neutron C Electron D Nucleon

23

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

24

The relative atomic mass of an element is the weighted average of the masses of its isotopes relative to:

A Carbon-12 atom B Hydrogen-1 atom C Oxygen-16 atom D Nitrogen-14 atom

25

Protons and neutrons together are called:

A Nucleons B Electrons C Ions D Anions