Font size
WorksheetsUnit 3 Test Review (Atomic Theory and Structure)
Total questions: 40
Worksheet time: 28mins
Which of the following is NOT part of Dalton’s atomic theory?
All elements are composed of atoms.
Atoms are always in motion.
Atoms of the same element are identical
Atoms that combine do so in simple whole-number ratios.
Who was the first person to suggest the idea of atoms, in the 4th century B.C.?
Atomos
Dalton
Democritus
Galileo
Aristotle
The nucleus of the atom:
is positively charged and has a high density.
is positively charged and has a low density.
is negatively charged and has a high density.
is negatively charged and has a low density.
The number of neutrons in the nucleus can be calculated by:
adding together the number of electrons and protons.
subtracting the number of electrons from the number of protons.
subtracting the number of protons from the mass number.
adding the mass number to the number of electrons.
Isotopes of the same element have different:
numbers of neutrons
numbers of protons
numbers of electrons
atomic numbers
The number 84 in the name krypton-84 represents
the atomic number
the mass number
The sum of the protons and electrons
none of these
Who discovered the nucleus?
Rutherford
Chadwick
Thomson
Dalton
Using the periodic table, determine the number of neutrons in uranium-238.
92
238
146
235
155
Which set of quantum numbers is correct for an electron in a 3d sublevel?
3,3,0,1/2
3,2,0,1/2
3,1,0,-1/2
3,2,3,1/2
Which set of quantum numbers could represent the outermost electron in a Na atom (ground state)?
2,0,0,-1/2
3,1,0,1/2
3,0,0,1/2
2,1,0,1/2
The atomic mass of an element:
depends upon the number of protons and neutrons in the nucleus.
depends upon the mass of each isotope of that element
depends upon the relative abundance of each isotope of the element.
all of the above
The electron’s mass is _________ the mass of a proton.
less than
more than
approximately equal to
In Thomson’s “Plum Pudding Model” of the atom:
the positive charge is concentrated in the nucleus.
the positive charge is diffuse with negatively charged particles distributed throughout.
the negative charge is concentrated in the center of the atom
electrons and protons comprise the nucleus
Which radiation has the shortest wavelength?
x-ray
visible
infrared
ultraviolet
Which light has the shortest wavelength?
green
violet
yellow
red
Which is a set of possible quantum numbers?
4,4,2,1/2
4,3,-4,1/2
4,3,2,-1/2
4,3,2,1
Which element has a partially-filled f subshell?
Ba
Eu
Re
Bi
How many orbitals have the quantum numbers n = 4 and l = 2?
1
3
5
7
For which element is the "last electron" added to a d orbital?
Ba
Nd
Hf
Pb
The most abundant isotope of hydrogen is
protium
deuterium
tritium
quatrium
If Q is the symbol for an element, which two of the following symbols represent isotopes of the same element? Choose two answers!
What is the atomic number of this isotope?
(a)
What is the mass number of this isotope?
(a)
How many protons does this isotope have?
(a)
How many electrons does this isotope have?
(a)
How many neutrons does this isotope have?
(a)
What is the atomic number of this isotope?
(a)
What is the mass number of this isotope?
(a)
How many protons does this isotope have?
(a)
How many electrons does this isotope have?
(a)
How many neutrons does this isotope have?
(a)
Calculate the average atomic mass of element X, given that it consists of the following percentages of isotopes with masses shown:
68.33 amu
68.33%
4,030 amu
.6833 amu
Write the symbol of the unknown isotope.
(a)
Write the symbol of the unknown isotope.
(a)
Write the symbol of the unknown isotope.
(a)
How many unpaired electrons are in a nitrogen atom?
(a)
The maximum number of electrons in an atom that can have a quantum number n=3 and l=2 is
(a)
How many electrons in a titanium atom have n=3 and l=2?
(a)
What is the maximum number of electrons that a 2d sublevel can hold
2
6
10
14
not possible
What does the electron configuration for Cr end with?
3d3
4d3
3d4
4d4
