Question 1

Given that helium has an isotope  , how many electrons does an atom of this helium isotope contain?

Accepted Answer

A)  1
B)  2
C)  4
D)  6
E)  0

Question 2

What is always true for a neutral atom?

Accepted Answer

A)  There is an equal number of protons and neutrons.
B)  There is an equal number of protons and electrons.
C)  There is an equal number of protons, neutrons, and electrons.
D)  The number of protons and neutrons is an even number.
E)  The number of protons, neutrons, and electrons is an even number.

Question 3

How many valence electrons are in Na, O and He, respectively?

Accepted Answer

A)  1, 6, 8
B)  11, 8, 8
C)  1, 6, 2
D)  11, 8, 2
E)  2, 4, 2

Question 4

Sulfur (S) is one of the representative elements.

Accepted Answer

A) True 
 B)False

Question 5

Electron affinity is

Accepted Answer

A)  the energy required to remove an electron from an isolated atom.
B)  the force between two electrons in the same orbital.
C)  the force between two ions of opposite charge.
D)  the energy released when an isolated atom gains an electron.
E)  the attraction of an atom for an electron in a chemical bond.

Question 6

Valence electrons are involved when atoms form bonds.

Accepted Answer

A) True 
 B)False

Question 7

What is the general name given to the elements of Group IA (1) ?

Accepted Answer

A)  halogens
B)  alkali metals
C)  alkaline earth metals
D)  noble gases
E)  metalloids

Question 8

There are eight valence electrons in a chlorine anion.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following gives the correct charge of the ion according to the octet rule?

Accepted Answer

A)  F+
B)  Ba2-
C)  (S2-) 
D)  P3+
E)  C2+

Question 10

What can be said about the possibility of the existence of the hydrogen isotope represented by the symbol shown below?

Accepted Answer

A)  This isotope of hydrogen is not possible because it has no electrons.
B)  This isotope of hydrogen is not possible because atoms of hydrogen have one proton.
C)  This isotope of hydrogen is possible; it simply contains no protons and is an ion.
D)  This isotope of hydrogen is possible; it simply contains no neutrons.
E)  This isotope of hydrogen is possible; it simply has two neutrons.

Question 11

The halogens, Group VII A (17), have the lowest ionization energies of any group in the periodic table.

Accepted Answer

A) True 
 B)False

Question 12

Which statement explains why isotopes have different mass numbers?

Accepted Answer

A)  Isotopes differ in the number of protons each contains.
B)  Isotopes differ in the number of electrons each contains.
C)  Isotopes differ in the number of neutrons each contains.
D)  Isotopes differ in the number of protons and neutrons each contains.
E)  Isotopes differ in the number of protons and electrons each contains.

Question 13

Which sublevel has the lowest energy?

Accepted Answer

A)  2s
B)  3p
C)  4p
D)  4s
E)  2p

Question 14

How many valence electrons are present in a chloride ion, Cl??

Accepted Answer

A)  5
B)  7
C)  8
D)  17
E)  18

Question 15

Which best explains why an Al3+ ion is smaller than an Al atom?

Accepted Answer

A)  In forming the Al3+ ion, the Al atom loses the electrons in its outermost energy level, causing a decrease in the atomic radius.
B)  In forming the Al3+ ion, the Al atom gains three protons and the resulting net positive charge keeps the electrons more strongly attracted to the nucleus, reducing the radius.
C)  The Al3+ ion contains more electrons than the Al atom, which results in a greater attraction for the nucleus and a smaller atomic radius.
D)  In forming the Al3+ ion, the Al atom adds electrons into a higher energy level, causing a decrease in the atomic radius.
E)  There are more protons in an Al3+ ion than there are in an Al atom.

Question 16

In Mendeleev's table, the elements were arranged according to their atomic mass.

Accepted Answer

A) True 
 B)False

Question 17

Which statement about the modern periodic table is FALSE?

Accepted Answer

A)  Elements are arranged in order of increasing atomic number.
B)  A period is a horizontal row of elements.
C)  A group is a vertical column of elements.
D)  A stepwise line separates the metals from the nonmetals; metals are to the left of the line, nonmetals are to the right of the line.
E)  Elements in the same period share similar chemical and physical properties.

Question 18

What property of light is defined by the distance between identical points on adjacent waves?

Accepted Answer

A)  energy
B)  speed
C)  wavelength
D)  spectrum
E)  amplitude

Question 19

What kind(s)  of particles can be found outside the nucleus of an atom?

Accepted Answer

A)  protons
B)  neutrons
C)  electrons
D)  protons and electrons
E)  protons and neutrons

Question 20

Who discovered the existence of the atomic nucleus?

Accepted Answer

A)  Crookes
B)  Thomson
C)  Geiger
D)  Rutherford
E)  Bohr

Exam 2: The Structure of the Atom and the Periodic Table

What is always true for a neutral atom?

Correct AnswerverifiedShow Answer

Which best explains why an Al3+ ion is smaller than an Al atom?

Correct AnswerverifiedShow Answer

In Mendeleev's table, the elements were arranged according to their atomic mass.

Correct AnswerverifiedShow Answer

How many valence electrons are present in a chloride ion, Cl??

Correct AnswerverifiedShow Answer

What can be said about the possibility of the existence of the hydrogen isotope represented by the symbol shown below?

Correct AnswerverifiedShow Answer

Sulfur (S) is one of the representative elements.

Correct AnswerverifiedShow Answer

Valence electrons are involved when atoms form bonds.

Correct AnswerverifiedShow Answer

Which statement about the modern periodic table is FALSE?

Correct AnswerverifiedShow Answer

Which statement explains why isotopes have different mass numbers?

Correct AnswerverifiedShow Answer

There are eight valence electrons in a chlorine anion.

Correct AnswerverifiedShow Answer

What property of light is defined by the distance between identical points on adjacent waves?

Correct AnswerverifiedShow Answer

How many valence electrons are in Na, O and He, respectively?

Correct AnswerverifiedShow Answer

Electron affinity is

Correct AnswerverifiedShow Answer

Which of the following gives the correct charge of the ion according to the octet rule?

Correct AnswerverifiedShow Answer

The halogens, Group VII A (17), have the lowest ionization energies of any group in the periodic table.

Correct AnswerverifiedShow Answer

Given that helium has an isotope , how many electrons does an atom of this helium isotope contain?

Correct AnswerverifiedShow Answer

Which sublevel has the lowest energy?

Correct AnswerverifiedShow Answer

Who discovered the existence of the atomic nucleus?

Correct AnswerverifiedShow Answer

What kind(s) of particles can be found outside the nucleus of an atom?

Correct AnswerverifiedShow Answer

What is the general name given to the elements of Group IA (1) ?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Which best explains why an Al³⁺ ion is smaller than an Al atom?

Correct Answer
verified

Correct Answer
verified

How many valence electrons are present in a chloride ion, Cl^??

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified