Question 1

When a strontium atom loses two electrons, it becomes a(n) _____ with a charge of _____.

Accepted Answer

A)  anion; 2+ 
B)  anion; 2 −  
C)  cation; 2 −  
D)  cation; 2+ 
E)  cation; 0 
A)  anion; 2+ 
B)  anion; 2 −  
C)  cation; 2 −  
D)  cation; 2+ 
E)  cation; 0

Question 2

Strontium is a member of which group/family?

Accepted Answer

A)  Halogens 
B)  Noble gases 
C)  Alkali metals 
D)  Transition metals 
E)  Alkaline earth metals 
A)  Halogens 
B)  Noble gases 
C)  Alkali metals 
D)  Transition metals 
E)  Alkaline earth metals

Question 3

The elements of the group 1 A will all form ions. These ions will be _____ and will have a charge of _____.

Accepted Answer

A)  cations; 2+ 
B)  anions; 2 − 
C)  cations; 3+ 
D)  anions; 1 − 
E)  cations; 1+ 
A)  cations; 2+ 
B)  anions; 2 − 
C)  cations; 3+ 
D)  anions; 1 − 
E)  cations; 1+

Question 4

Which of the following is true?

Accepted Answer

A)  Carbon and silicon have the same number of electrons. 
B)  Carbon and silicon have the same number of valence electrons. 
C)  Carbon and oxygen have the same number of electrons. 
D)  Carbon and nitrogen have the same number of valence electrons. 
E)  Carbon and aluminum have the same number of valence electrons. 
A)  Carbon and silicon have the same number of electrons. 
B)  Carbon and silicon have the same number of valence electrons. 
C)  Carbon and oxygen have the same number of electrons. 
D)  Carbon and nitrogen have the same number of valence electrons. 
E)  Carbon and aluminum have the same number of valence electrons.

Question 5

Metals tend to form ions with a positive charge. The most likely way to form a positively charged ion from an atom is by doing which of the following?

Accepted Answer

A)  Gaining electron(s) 
B)  Gaining proton(s) 
C)  Losing electron(s) 
D)  Losing proton(s) 
E)  Losing neutron(s) 
A)  Gaining electron(s) 
B)  Gaining proton(s) 
C)  Losing electron(s) 
D)  Losing proton(s) 
E)  Losing neutron(s)

Question 6

The number of neutrons in an element is equal to _____.

Accepted Answer

A)  the difference between its atomic mass and atomic number 
B)  the number of electrons in the element 
C)  the number of isotopes in the element 
D)  the sum of its electrons and protons 
E)  its atomic number 
A)  the difference between its atomic mass and atomic number 
B)  the number of electrons in the element 
C)  the number of isotopes in the element 
D)  the sum of its electrons and protons 
E)  its atomic number

Question 7

Which of the following has the largest mass of oxygen ?

Accepted Answer

A)  16.0 g of O2 
B)  0.500 mole of O2 
C)  6.022 × 1023 molecules of O2 
D)  10 grams of carbon dioxide CO2 
E)  All of these have the same mass of oxygen. 
A)  16.0 g of O2 
B)  0.500 mole of O2 
C)  6.022 × 1023 molecules of O2 
D)  10 grams of carbon dioxide CO2 
E)  All of these have the same mass of oxygen.

Question 8

Rubidium consists of two naturally occurring isotopes rubidium-85 and rubidium-87. Rubidium-85 (85Rb) has an isotopic mass of 84.9117 amu and a 72.15% abundance. Rubidium-87(87Rb) has a 27.85% abundance. The atomic weight of rubidium is 85.4768 amu. Determine the isotopic mass of 87Rb?

Accepted Answer

A)  86. 7237  amu 
B)  86.8013 amu 
C)  86.8220 amu 
D)  86.8621 amu 
E)  86.9411 amu 
A)  86. 7237  amu 
B)  86.8013 amu 
C)  86.8220 amu 
D)  86.8621 amu 
E)  86.9411 amu

Question 9

Which of these elements has two valence electrons?

Accepted Answer

A)  Mg 
B)  Li 
C)  Al 
D)  S 
E)  Cl 
A)  Mg 
B)  Li 
C)  Al 
D)  S 
E)  Cl

Question 10

Which family/group is largely unreactive?

Accepted Answer

A)  Halogens 
B)  Noble gases 
C)  Alkali metals 
D)  Transition metals 
E)  Alkaline earth metals 
A)  Halogens 
B)  Noble gases 
C)  Alkali metals 
D)  Transition metals 
E)  Alkaline earth metals

Question 11

When an oxygen atom gains two electrons, it becomes a(n) _____ with a charge of _____.

Accepted Answer

A)  anion; 2+ 
B)  anion ; 2 −  
C)  cation; 2 −  
D)  cation; 2+ 
E)  cation; 0 
A)  anion; 2+ 
B)  anion ; 2 −  
C)  cation; 2 −  
D)  cation; 2+ 
E)  cation; 0

Question 12

Elements belonging to the same group have the same _____.

Accepted Answer

A)  mass number 
B)  atomic number 
C)  number of neutrons 
D)  number of electrons 
E)  number of valence electrons 
A)  mass number 
B)  atomic number 
C)  number of neutrons 
D)  number of electrons 
E)  number of valence electrons

Question 13

Which of these statements about Bohr's model of the atom is incorrect ?

Accepted Answer

A)  Electrons fill lower energy orbits first. 
B)  The greater the quantum number the higher the energy of an orbit. 
C)  Electrons occupy orbits with certain radii that correspond to discrete energies. 
D)  Elements with the same number of electrons in their outer orbit undergo similar chemical reactions. 
E)  Electrons in the innermost energy orbit are called valence electrons. 
A)  Electrons fill lower energy orbits first. 
B)  The greater the quantum number the higher the energy of an orbit. 
C)  Electrons occupy orbits with certain radii that correspond to discrete energies. 
D)  Elements with the same number of electrons in their outer orbit undergo similar chemical reactions. 
E)  Electrons in the innermost energy orbit are called valence electrons.

Question 14

Which of the following statements about electrons is incorrect ?

Accepted Answer

A)  Electrons are negatively charged. 
B)  Electrons have a negligible mass compared to the rest of the atom. 
C)  Electrons exist in the nucleus of the atom. 
D)  The number of electrons equals the atomic number in a neutral atom. 
E)  Electrons experience a strong attraction to a positively charged nucleus. 
A)  Electrons are negatively charged. 
B)  Electrons have a negligible mass compared to the rest of the atom. 
C)  Electrons exist in the nucleus of the atom. 
D)  The number of electrons equals the atomic number in a neutral atom. 
E)  Electrons experience a strong attraction to a positively charged nucleus.

Question 15

Which of these statements concerning the atomic mass is correct?

Accepted Answer

A)  The a tomic mass is the same as the mass number of the most common isotope. 
B)  The atomic mass is derived from the weight of the most common isotope of an element. 
C)  The atomic mass is determined by adding the masses of the protons, electrons, and neutrons in the atom. 
D)  The atomic mass is calculated from the atomic masses of the two most common isotopes. 
E)  The atomic mass is a weighted average of the masses of the naturally occurring isotopes. 
A)  The a tomic mass is the same as the mass number of the most common isotope. 
B)  The atomic mass is derived from the weight of the most common isotope of an element. 
C)  The atomic mass is determined by adding the masses of the protons, electrons, and neutrons in the atom. 
D)  The atomic mass is calculated from the atomic masses of the two most common isotopes. 
E)  The atomic mass is a weighted average of the masses of the naturally occurring isotopes.

Question 16

Which of these elements has three valence electrons?

Accepted Answer

A)  Mg 
B)  Li 
C)  Al 
D)  S 
E)  Cl 
A)  Mg 
B)  Li 
C)  Al 
D)  S 
E)  Cl

Question 17

Isotopes of an element have the same number of _____ but a different number of _____.

Accepted Answer

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

Question 18

Which scientist is responsible for the theory that explains why properties of elements recur in a periodic fashion?

Accepted Answer

A)  Bohr 
B)  Galileo 
C)  Dalton 
D)  Avogadro 
E)  Mendeleev 
A)  Bohr 
B)  Galileo 
C)  Dalton 
D)  Avogadro 
E)  Mendeleev

Question 19

What are the values of Z and A for an atom of silicon that contains 15 neutrons?

Accepted Answer

A)  Z=14, A=15 
B)  Z=15, A=14 
C)  Z=29, A=14 
D)  Z=14, A=29 
E)  Z=15, A=29 
A)  Z=14, A=15 
B)  Z=15, A=14 
C)  Z=29, A=14 
D)  Z=14, A=29 
E)  Z=15, A=29

Question 20

What is the charge on an ion that contains 16 protons and 18 electrons?

Accepted Answer

A)  0 
B)  +2 
C)  − 2 
D)  -18 
E)  None of these. 
A)  0 
B)  +2 
C)  − 2 
D)  -18 
E)  None of these.

When a strontium atom loses two electrons, it becomes a(n) _ with a charge of _.

Strontium is a member of which group/family?

The elements of the group 1 A will all form ions. These ions will be _ and will have a charge of _.

Which of the following is true?

Metals tend to form ions with a positive charge. The most likely way to form a positively charged ion from an atom is by doing which of the following?

The number of neutrons in an element is equal to _____.

Which of the following has the largest mass of oxygen ?

Rubidium consists of two naturally occurring isotopes rubidium-85 and rubidium-87. Rubidium-85 (⁸⁵Rb) has an isotopic mass of 84.9117 amu and a 72.15% abundance. Rubidium-87(⁸⁷Rb) has a 27.85% abundance. The atomic weight of rubidium is 85.4768 amu. Determine the isotopic mass of ⁸⁷Rb?

Which of these elements has two valence electrons?

Which family/group is largely unreactive?

When an oxygen atom gains two electrons, it becomes a(n) _ with a charge of _.

Elements belonging to the same group have the same _____.

Which of these statements about Bohr's model of the atom is incorrect ?

Which of the following statements about electrons is incorrect ?

Which of these statements concerning the atomic mass is correct?

Which of these elements has three valence electrons?

Isotopes of an element have the same number of _ but a different number of _.

Which scientist is responsible for the theory that explains why properties of elements recur in a periodic fashion?

What are the values of Z and A for an atom of silicon that contains 15 neutrons?

What is the charge on an ion that contains 16 protons and 18 electrons?

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Exam 3: Atoms and Elements

When a strontium atom loses two electrons, it becomes a(n) _____ with a charge of _____.

Strontium is a member of which group/family?

The elements of the group 1 A will all form ions. These ions will be _____ and will have a charge of _____.

Which of the following is true?

Metals tend to form ions with a positive charge. The most likely way to form a positively charged ion from an atom is by doing which of the following?

The number of neutrons in an element is equal to _____.

Which of the following has the largest mass of oxygen ?

Rubidium consists of two naturally occurring isotopes rubidium-85 and rubidium-87. Rubidium-85 (85Rb) has an isotopic mass of 84.9117 amu and a 72.15% abundance. Rubidium-87(87Rb) has a 27.85% abundance. The atomic weight of rubidium is 85.4768 amu. Determine the isotopic mass of 87Rb?

Which of these elements has two valence electrons?

Which family/group is largely unreactive?

When an oxygen atom gains two electrons, it becomes a(n) _____ with a charge of _____.

Elements belonging to the same group have the same _____.

Which of these statements about Bohr's model of the atom is incorrect ?

Which of the following statements about electrons is incorrect ?

Which of these statements concerning the atomic mass is correct?

Which of these elements has three valence electrons?

Isotopes of an element have the same number of _____ but a different number of _____.

Which scientist is responsible for the theory that explains why properties of elements recur in a periodic fashion?

What are the values of Z and A for an atom of silicon that contains 15 neutrons?

What is the charge on an ion that contains 16 protons and 18 electrons?

Molecular Reasons

The Chemists Toolbox

Molecules, Compounds, and Chemical Reactions

Chemical Bonding

Organic Chemistry

Light and Color

Nuclear Chemistry

Energy for Today

Energy for Tomorrow: Solar and Other Renewable Energy Sources

The Air Around Us

The Liquids and Solids Around Us: Especially Water

Acids and Bases: the Molecules Responsible for Sour and Bitter

Oxidation and Reduction

The Chemistry of Household Products

Biochemistry and Biotechnology

Drugs and Medicine: Healing, Helping, and Hurting

The Chemistry of Food

Nanotechnology Online Only

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When a strontium atom loses two electrons, it becomes a(n) _ with a charge of _.

The elements of the group 1 A will all form ions. These ions will be _ and will have a charge of _.

Rubidium consists of two naturally occurring isotopes rubidium-85 and rubidium-87. Rubidium-85 (⁸⁵Rb) has an isotopic mass of 84.9117 amu and a 72.15% abundance. Rubidium-87(⁸⁷Rb) has a 27.85% abundance. The atomic weight of rubidium is 85.4768 amu. Determine the isotopic mass of ⁸⁷Rb?

When an oxygen atom gains two electrons, it becomes a(n) _ with a charge of _.

Isotopes of an element have the same number of _ but a different number of _.