Question 1

How many electrons are in a neutral atom of bromine-81?

Accepted Answer

A)   1
B)   35
C)   36
D)   81

Question 2

How many atoms are in 1.00 kg of copper?

Accepted Answer

A)   3.83 × 1029 atoms
B)   3.83 × 1022 atoms
C)   15.74 atoms
D)   2.61 × 10-23 atoms
E)   9.48 × 1024 atoms

Question 3

Calculate the atomic mass of gallium if gallium has two naturally occurring isotopes with the following masses and natural abundances: 
Ga-69 68.9256 u 60.11%
Ga-71 70.9247 u 39.89%

Accepted Answer

A)   69.72 u
B)   69.93 u
C)   70.00 u
D)   69.80 u
E)   70.68 u

Question 4

When forming an ion, oxygen, O, will normally ________ electron(s) .

Accepted Answer

A)   gain one
B)   gain two
C)   gain three
D)   lose one
E)   lose two

Question 5

Silver has an atomic mass of 107.868 u. The Ag-109 isotope (108.905 u)  has an abundance of 48.161%. What is the atomic mass, in u, of the other isotope?

Accepted Answer

A)   106.905 u
B)   106.908 u
C)   106.903 u
D)   106.911 u

Question 6

What group of elements in the periodic table are the most unreactive and why?

Accepted Answer

The noble gases are the most u...

Question 7

Predict the charge that an ion formed from bromine would have.

Accepted Answer

A)   1-
B)   2+
C)   1+
D)   4+
E)   2-

Question 8

What is the chemical symbol for copper?

Accepted Answer

A)   Co
B)   Cr
C)   Cu
D)   C

Question 9

Calcium, a metal with 20 electrons, tends to lose two, forming a 2+ cation that has the same number of electrons as ________.

Accepted Answer

A)   Helium
B)   Neon
C)   Argon
D)   Krypton
E)   Xenon

Question 10

How many electrons are in the ion P3-?

Accepted Answer

A)   12
B)   18
C)   28
D)   34

Question 11

Which of the following statement is FALSE?

Accepted Answer

A)   Elements are organized in order of increasing atomic number on the periodic table.
B)   Elements located on the boundary between the metals and nonmetals are metalloids.
C)   Similar elements are organized in the same period of the periodic table.
D)   Nonmetals are organized on the upper-right side of the periodic table.
E)   Elements on the left side and in the centre of the periodic table are metals.

Question 12

Rubidium, a metal with 37 electrons, tends to lose one, forming a 1+ cation that has the same number of electrons as ________.

Accepted Answer

A)   Helium
B)   Neon
C)   Argon
D)   Krypton
E)   Xenon

Question 13

Predict the charge of the most stable ion of chlorine.

Accepted Answer

A)   3+
B)   1-
C)   2-
D)   2+
E)   1+

Question 14

An atom of 82Kr contains ________ neutrons.

Accepted Answer

A)   36
B)   118
C)   46
D)   80
E)   82

Question 15

Barium belongs to the ________ group of the periodic table.

Accepted Answer

A)   alkali metal
B)   alkaline earth metal
C)   halogen
D)   noble gas

Question 16

What is the identity of element Q if the ion Q2+ contains 10 electrons?

Accepted Answer

A)   C
B)   O
C)   Ne
D)   Mg

Question 17

What does "X" represent in the following symbol?  X

Accepted Answer

A)   mercury
B)   chlorine
C)   scandium
D)   bromine
E)   selenium

Question 18

Predict the charge of the most stable ion of sodium.

Accepted Answer

A)   2+
B)   3+
C)   1+
D)   2-
E)   1-

Question 19

The mass number is equal to ________.

Accepted Answer

A)   the sum of the number of the electrons and protons
B)   the sum of the number of the neutrons and electrons
C)   the sum of the number of protons, neutrons, and electrons
D)   the sum of the number of protons and neutrons

Question 20

Which of the following statements is TRUE?

Accepted Answer

A)   Similar elements are organized in the same period of the periodic table.
B)   Generally, the charge on the cations of the main-group elements is equal to the group number.
C)   Non-metals are organized on the upper-left side of the periodic table.
D)   Elements on the right side and in the centre of the periodic table are non-metals.
E)   Elements are organized in order of decreasing atomic number on the periodic table.

Exam 2: Atoms and Elements

Which of the following statements is TRUE?

Correct AnswerverifiedShow Answer

Predict the charge that an ion formed from bromine would have.

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The mass number is equal to ________.

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How many atoms are in 1.00 kg of copper?

Correct AnswerverifiedShow Answer

What group of elements in the periodic table are the most unreactive and why?

Correct AnswerverifiedThe noble gases are the most u...View AnswerShow Answer

Rubidium, a metal with 37 electrons, tends to lose one, forming a 1+ cation that has the same number of electrons as ________.

Correct AnswerverifiedShow Answer

Calculate the atomic mass of gallium if gallium has two naturally occurring isotopes with the following masses and natural abundances: Ga-69 68.9256 u 60.11% Ga-71 70.9247 u 39.89%

Correct AnswerverifiedShow Answer

Predict the charge of the most stable ion of sodium.

Correct AnswerverifiedShow Answer

How many electrons are in the ion P3-?

Correct AnswerverifiedShow Answer

What is the chemical symbol for copper?

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An atom of 82Kr contains ________ neutrons.

Correct AnswerverifiedShow Answer

Silver has an atomic mass of 107.868 u. The Ag-109 isotope (108.905 u) has an abundance of 48.161%. What is the atomic mass, in u, of the other isotope?

Correct AnswerverifiedShow Answer

When forming an ion, oxygen, O, will normally ________ electron(s) .

Correct AnswerverifiedShow Answer

How many electrons are in a neutral atom of bromine-81?

Correct AnswerverifiedShow Answer

Predict the charge of the most stable ion of chlorine.

Correct AnswerverifiedShow Answer

Barium belongs to the ________ group of the periodic table.

Correct AnswerverifiedShow Answer

What does "X" represent in the following symbol? X

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What is the identity of element Q if the ion Q2+ contains 10 electrons?

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Which of the following statement is FALSE?

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Calcium, a metal with 20 electrons, tends to lose two, forming a 2+ cation that has the same number of electrons as ________.

Correct AnswerverifiedShow Answer

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The noble gases are the most u...
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How many electrons are in the ion P^3-?

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An atom of ⁸²Kr contains ________ neutrons.

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What is the identity of element Q if the ion Q²⁺ contains 10 electrons?

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