ATomic Review Sheet
Topic 1
Part I - Multiple Choice Questions
1 Which two particles have approximately the same mass?
(1) proton and neutron (3) neutron and electron
(2) proton and electron (4) neutron and positron
2 Which statement is true about a proton and an electron?
(1) They have the same masses and the same charges.
(2) They have the same masses and different charges.
(3) They have different masses and the same charges.
(4) They have different masses and different charges.
3 The atomic mass of an element is the weighted average of the masses of
(1) its two most abundant isotopes (3) all of its naturally occurring isotopes
(2) its two least abundant isotopes (4) all of its radioactive isotopes
4 Which statement is true about the charges assigned to an electron and a proton?
(1) Both an electron and a proton are positive.
(2) An electron is positive and a proton is negative.
(3) An electron is negative and a proton is positive.
(4) Both an electron and a proton are negative.
5 Which statement best explains why most atomic masses on the Periodic Table are decimal numbers?
(1) Atomic masses are determined relative to an H–1 standard.
(2) Atomic masses are determined relative to an O–16 standard.
(3) Atomic masses are a weighted average of the naturally occurring isotopes.
(4) Atomic masses are an estimated average of the artificially produced isotopes.
6 An electron has a charge of
(1) –1 and the same mass as a proton (3) –1 and a smaller mass than a proton
(2) +1 and the same mass as a proton (4) +1 and a smaller mass than a proton
7 The atomic number of an atom is always equal to the number of its
(1) protons, only (3) protons plus neutrons
(2) neutrons, only (4) protons plus electrons
8 Which subatomic particle has no charge?
(1) proton (2) neutron (3) the nucleus (4)electron
9 The atomic mass of an element is calculated using the
(1) atomic number and the ratios of its naturally occurring
Part I - Multiple Choice Questions
1 Which two particles have approximately the same mass?
(1) proton and neutron (3) neutron and electron
(2) proton and electron (4) neutron and positron
2 Which statement is true about a proton and an electron?
(1) They have the same masses and the same charges.
(2) They have the same masses and different charges.
(3) They have different masses and the same charges.
(4) They have different masses and different charges.
3 The atomic mass of an element is the weighted average of the masses of
(1) its two most abundant isotopes (3) all of its naturally occurring isotopes
(2) its two least abundant isotopes (4) all of its radioactive isotopes
4 Which statement is true about the charges assigned to an electron and a proton?
(1) Both an electron and a proton are positive.
(2) An electron is positive and a proton is negative.
(3) An electron is negative and a proton is positive.
(4) Both an electron and a proton are negative.
5 Which statement best explains why most atomic masses on the Periodic Table are decimal numbers?
(1) Atomic masses are determined relative to an H–1 standard.
(2) Atomic masses are determined relative to an O–16 standard.
(3) Atomic masses are a weighted average of the naturally occurring isotopes.
(4) Atomic masses are an estimated average of the artificially produced isotopes.
6 An electron has a charge of
(1) –1 and the same mass as a proton (3) –1 and a smaller mass than a proton
(2) +1 and the same mass as a proton (4) +1 and a smaller mass than a proton
7 The atomic number of an atom is always equal to the number of its
(1) protons, only (3) protons plus neutrons
(2) neutrons, only (4) protons plus electrons
8 Which subatomic particle has no charge?
(1) proton (2) neutron (3) the nucleus (4)electron
9 The atomic mass of an element is calculated using the
(1) atomic number and the ratios of its naturally occurring