WorksheetsUnit 1 Test Review
Total questions: 35
Worksheet time: 18mins
An atom of 4018Ar has a nucleus that contains a total of
18 electrons
18 protons
18 neutrons
18 nucleons
The arrangement of the elements in the present Periodic Table is based on atomic
mass
number
radius
density
Different isotopes of the same element must have a different
mass number
atomic number
number of protons
number of electrons
In all samples of the element potassium, each atom has
19 protons
20 neutrons
39 protons and neutrons
39 nucleons
Use this element from the Periodic Table to answer the question. What is the atomic mass for silicon?
14.0
14.1
28.1
42.1
A neutral atom contains 12 neutrons and 11 electrons. The number of protons in this atom is
1
11
12
23
An atom that has an electron configuration of 1s22s22p63s23p64s23d5
an alkali metal
an alkaline earth metal
a transition element
a noble gas element
Why are the noble gases so unreactive?
Their outer shell has 1 electron.
Their outer shell has 2 electrons.
Their outer shell is filled.
Their outer shell needs one electron to be full.
Within Period 2 of the Periodic Table, as the atomic number increases, the atomic radius generally
decreases
increases
remains the same
Which is the electron configuration of an atom of a Period 3 element?
1s22s1
1s22s22p1
1s22s22p3
1s22s12p63s1
A Ca2+ ion differs from a Ca0 atom in that the Ca2+ ion has
more protons
fewer protons
more electrons
fewer electrons
What is the mass number of an ion that consists of 20 protons, 20 neutrons, and 18 electrons?
18
20
38
40
Use the picture of an atom above to answer the question. Which statement best describes the part of the atom that is shown by the arrow?
It is an electron, and it has a negative charge.
it is an electron, and it has a positive charge.
It is a proton, and it has a negative charge.
It is a proton, and it has a positive charge.
The nucleus of an atom contains 8 protons and 6 neutrons. The total number of electrons present in a neutral atom of this element is
6
7
8
14
What was Niels Bohr's prediction about the location of the electrons in an atom?
Electrons pair with protons and stay in the nucleus of an atom.
Electrons can be found at various levels within an energy cloud surrounding the nucleus.
Electrons orbit the nucleus in well-defined energy levels or orbitals.
Electrons are scattered randomly in a positive background matrix.
Which best describes the current model of an atom?
A solid sphere with electrons and protons embedded
A solid sphere unique for everything that exists
A central nucleus containing protons and neutrons with electrons orbiting in levels of high probability
A central nucleus containing protons with electrons orbiting in specific paths
Which part of Dalton's atomic theory was disproved by further scientific research?
All elements are composed of atoms.
Atoms are indivisible particles.
Atoms of different elements are different.
Compounds are composed of two or more elements.
How does an S2- ion differ from an electrically neutral sulfur atom?
mass number
atomic number
nuclear charge
number of electrons
Which subatomic particles have a mass of approximately 1 amu each?
proton and electron
proton and neutron
neutron and positron
electron and positron
What is the atomic number of an element whose atoms each contain 47 protons, 60 neutrons, and 47 electrons?
47
53
60
107
After bombarding a gold foil sheet with alpha particles, scientists concluded that atoms consist mainly of
electrons
empty space
protons
neutrons
The number of neutrons in the nucleus of an atom can be determined by
adding the atomic number to the mass number
subtracting the atomic number from the mass number
adding the mass number to the atomic mass
subtracting the mass number from the atomic number
Which symbol represents an alkaline earth element?
Na
Mg
Ne
Ag
Which element in Period 3 has the largest atomic radius?
Cl
Al
Na
P
Iodine would have chemical properties most like
manganese (Mn)
tellurium (Te)
chlorine (Cl)
xenon (Xe)
The table above shows the atomic of four stable calcium (Ca) isotopes. What characteristic is different in each isotope?
the position in the Periodic Table of the elements
the net charge of the nucleus
the mass of the protons in the nucleus
the number of neutrons in the nucleus
Which of the following atoms has the largest atomic radius?
barium (Ba)
chlorine (Cl)
iodine (I)
magnesium (Mg)
Which element has the electron configuration 1s22s22p3?
boron
nitrogen
fluorine
phosphorus
Which two elements have the same number of valence electrons?
C and O
Na and Mg
Cl and F
Ga and Ge
Which best represents the electron configuration for an atom of iron?
1s22s22p63s23p64s23d6
1s21p62s22p63s23p64s2
1s22s22p63s23p63d8
1s22s22p63s23p64s24d6
Which of the following elements has the lowest ionization energy?
Na
K
Br
Cl
A diagram of the Periodic Table of the elements is shown above. In which region of the table would inner transition metals be found?
4
3
2
1
Which of the following atoms has the largest ionization energy?
barium (Ba)
chlorine (Cl)
iodine (I)
magnesium (Mg)
A 100-g sample of naturally occurring boron contains 19.78% of B-10 and 80.22% of B-11. Which numerical setup can be used to determine the atomic mass of naturally occurring B
(10)(.8022) + (11)(.1978)
(10)(.1978) / (11)(.8022)
(10)(.1978) + (11)(.8022)
(10)(.8022) / (11)(.1978)
An atom in the ground state has a stable electron configuration. This atom could be an atom of
Al
Cl
Na
Ne
