Unit 1 Standards Review
by Edith White
| 19 Questions
Note from the author:
Atomic Structure and the history of Atomic Theory
In the late 1800s, experiments using cathode ray tubes led to the discovery of the
Which conclusion was drawn from the results of the gold foil experiment?
an atom is electrically neutral
an atom is mostly empty space
the nucleus of an atom is negatively charged
the electrons of an atom are located in specific shells
As a result of the gold foil experiment, it was concluded that an atom:
contains protons, neutrons and electrons
contains a small, dense nucleus
has positrons and orbitals
is a hard, indivisible sphere
Which group of atomic models is listed in historical order from the earliest to the most recent?
hard sphere, wave mechanical, electron shell
hard sphere, electron shell, wave mechanical
electron shell, wave mechanical, hard sphere
electron shell, hard sphere, wave mechanical
Given a list of atomic model descriptions:
A: electron shells outside a central nucleus
B: hard, indivisible sphere
C: mostly empty space
A, B, C
A, C, B
B, C, A
B, A, C
Which phrase correctly describes an atom?
positively charged electron cloud surrounding a positively charged nucleus
positively charged electron cloud surrounding a negatively charged nucleus
negatively charged electron cloud surrounding a positively charged nucleus
negatively charged electron cloud surrounding a negatively charged nucleus
Which subatomic particle has a negative charge?
Which subatomic particles are located in the nucleus of a carbon atom?
protons and neutrons
protons and electrons
Which statement matches a subatomic particle with its charge?
a neutron has a negative charge
a proton has a negative charge
a neutron has no charge
a proton has no charge
The total number of electrons of an element is always equal to the atom's:
number of neutrons
Which statement compares the masses of two subatomic particles?
the mass of an electron is greater than the mass of a proton
the mass of an electron is greater than the mass of a neutron
the mass of a proton is greater than the mass of an electron
the mass of a proton is greater than the mass of a neutron
The nuclides I-131 and I-133 are classified as
isomers of the same element
isomers of Xe-131 and Cs-133
isotopes of the same element
isotopes of Xe-131 and Cs-133
Which statemnt describes a concept included in the wave mechanical model of the atom?
positrons are located in shells outside the nucleus
neutrons are located in shells outside the nucleus
protons are located in orbitals outside the nucleus
electrons are located in orbitals outside the nucleus
Which electron configuration represents an excited state for an atoms of calcium?
A specific amount of energy is emitted when excited electrons in an atom in a sample of an element return to the ground state. This emitted energy can be used to determine the:
mass of the sample
volume of the sample
identity of the element
number of moles of the element
Which two elements have the most similar chemical properties?
beryllium and magnesium
hydrogen and helium
phosphorous and sulfur
potassium and strontium
Compared to an atom of C-12, an atom of C-14 has a greater
number of electrons
number of protons
Calculate the average isotopic mass for chlorine if 75.0% is Cl-35 and 25.0% is Cl-37.
A magnesium atom that loses two electrons becomes a
positive ion with a smaller radius
negative ion with a smaller radius
positive ion with a larger radius
negative ion with a smaller radius
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