WorksheetsUnit 2 Test Review
Total questions: 30
Worksheet time: 2hrs 53mins
The identity of a chemical element is determined by which of the following?
The number of protons it possesses
The number of neutrons it possesses
The sum of the number of protons and neutrons it possesses
The number of electrons it possesses
Choose all that apply. Consider the species 46Sc, 48V and 44K. These species have
the same sum of protons and neutrons.
the same number of neutrons.
the same mass number.
the same number of electrons.
the same number of protons.
Choose all that apply. Consider the species Xe-134, Cs-134 and Ba-134. These species have
the same number of neutrons.
the same number of electrons.
the same sum of protons and neutrons.
the same number of protons.
the same mass number.
Choose all apply. Three are correct. Which of the following pairs are isoelectronic (same number of electrons)?
Cl-1 and Sc+3
N-3 and P-3
Zr+4 and Se-2
Mg+2 and F-2
Fe+2 and Cu+5
Choose all that apply. Neutral isotopes of the same element must have the same
mass number.
atomic mass.
number of protons.
number of electrons.
number of neutrons.
During a flame test, a copper salt produces a characteristic green flame because copper is releasing a quantum of energy in the form of green light. This green color is produced when electrons in excited copper atoms
move to higher energy states within the atoms.
are gained by the atoms.
return to lower energy states within the atoms.
are lost by the atoms.
Which atomic orbital has a four-leaf clover shape?
s
p
d
f
Choose all that apply. The outer electronic configuration ns2np3 could correspond to which of the following elements in its ground state?
Nitrogen
Arsenic
Sulfur
Magnesium
Vanadium
Which of the following pairs has the same number of full orbitals?
Pd and Ag
Na and Mg
Ti and V
N and O
What is the charge of an ion that contains 12 protons, 10 electrons, and 13 neutrons?
+1
+2
-1
-2
What is the mass number of an ion that contains 26 protons, 23 electrons, and 29 neutrons?
30
+3
55
56
49
What is the mass number of the most common isotope of nickel?
59
58
28
87
A S-2 ion differs from a sulfur atom in that the S-2 ion has
more protons.
less protons.
more electrons.
less electrons.
How many unpaired electrons does selenium have?
1
2
3
4
5
Choose all that apply. Bohr’s theory of the atom proposed that
electrons travel in circular paths at specific distances around the nucleus.
electrons occupy the lowest available energy level.
energy levels in an atom are quantized.
no more than two electrons are allowed in any energy level.
energy shells have subshells which contain regions of space called orbital.
The electron configuration 1s22s22p6 could represent which of the following ions?
O-2
Cl-1
Na+2
Be+2
On the periodic table shown, the column highlighted is called the pnictogens. How many valence electrons do pnictogens (column 15) have?
2
3
4
5
6
Which of the following atoms has the greatest number of valence electrons?
Strontium
Gallium
Phosphorus
Fluorine
Sulfur
Which of the following proton and electron configuration pairs has gained the most electrons?
40 protons, [Ar]4s23d104p6
53 protons, [Kr]5s24d105p6
33 protons, [Ar]4s23d104p6
20 protons, [Ne]3s23p6
Which of the following has the greatest number of unpaired electrons?
V
Cr
Mn
Fe
The atom fluorine has how many full orbitals?
2
3
4
5
6
The atom chlorine has how many total p electrons?
5
11
6
1
12
Choose all that apply. Three are correct. The quantum mechanical model of the atom
describes an electron probability distribution that determines the most likely location of an electron.
was the first model to incorporate quantized energy levels.
was the first model to incorporate subshells and orbitals.
considers that electrons behave as both particles and waves.
was the first model to show electrons orbiting the nucleus in circular paths.
Choose all that apply. Which of the following have a +3 charge?
Aluminum after losing three electrons
21 protons, [Ne]3s23p6
Phosphorus after gaining three electrons
33 protons, [Ar]4s33d104p6
50 protons, [Kr]5s24d105p5
Which orbital is shown?
px
py
pz
A major difference between a 1s orbital and a 2s orbital is that
the 2s can hold more electrons.
the 2s is at a higher energy level.
the 2s has a different shape.
the 1s can only hold 1 electron.
What is the number of atoms of carbon in the following molecule? CH3CO2(CH2)11CH3
11
14
13
4
A new element with the symbol Gz has two isotopes, 87Gz (87 amu) and 89Gz (89 amu). If the atomic mass of gomezium (Gz) is 88.5 g/mol, what is the ratio of each isotope?
Three Gz-87 to one Gz-89
One Gz-87 to three Gz-89
One Gz-87 to one Gz-89
One Gz-87 to two Gz-89
What is the atomic weight of a hypothetical element consisting of two isotopes, one with a mass of 52.03 amu (86.0%), and one with a mass of 50.99 amu? Answer is rounded to the correct number of significant figures.
51.9 amu
51.8 amu
52.0 amu
51.7 amu
51.6 amu
Which of the following is the correct number of protons, electrons, and neutrons for 74As-2?
A
B
C
D
E
