Question 1

How many protons (p)and neutrons (n)are in an atom of ${ } _ { 38 } ^ { 90 } \mathrm { Sr }$?

Accepted Answer

A) 38 p,52 n 
B) 38 p,90 n 
C) 52 p,38 n 
D) 90 p,38 n 
A) 38 p,52 n 
B) 38 p,90 n 
C) 52 p,38 n 
D) 90 p,38 n

Question 2

How many moles are in 2.16 × 1024 atoms of lead?

Accepted Answer

A) 35.9 moles 
B) 3.59 moles 
C) 0.359 moles 
D) 6.08 moles 
E) 1.79 moles 
A) 35.9 moles 
B) 3.59 moles 
C) 0.359 moles 
D) 6.08 moles 
E) 1.79 moles

Question 3

How many protons does the I- ion possess?

Accepted Answer

A) 52 
B) 54 
C) 4 
D) 7 
E) 53 
A) 52 
B) 54 
C) 4 
D) 7 
E) 53

Question 4

Calculate the atomic mass of element "X" if it has two naturally occurring isotopes with the following masses and natural abundances: 
X-45$\quad$ 44.8776 u $\quad$32.88%
X-47$\quad$ 46.9443 u $\quad$67.12%

Accepted Answer

A) 46.26 u 
B) 45.91 u 
C) 46.34 u 
D) 46.84 u 
E) 44.99 u 
A) 46.26 u 
B) 45.91 u 
C) 46.34 u 
D) 46.84 u 
E) 44.99 u

Question 5

When forming an ion,fluorine,F,will ________ electron(s).

Accepted Answer

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

Question 6

When forming an ion,calcium,Ca,will ________ electron(s).

Accepted Answer

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

Question 7

How many atoms of chlorine are in 354.53 g of chlorine?

Accepted Answer

A) 6.02214 × 10-23 
B) 6.02214 × 1023 
C) 6.02214 × 1024 
D) 6.02214 × 1025 
E) 6.02214 × 10-24 
A) 6.02214 × 10-23 
B) 6.02214 × 1023 
C) 6.02214 × 1024 
D) 6.02214 × 1025 
E) 6.02214 × 10-24

Question 8

The mass number of an atom of 67Ga is ________.

Accepted Answer

A) 31 
B) 76 
C) 36 
D) 67 
E) 70 
A) 31 
B) 76 
C) 36 
D) 67 
E) 70

Question 9

How many protons are in arsenic?

Accepted Answer

A) 33 
B) 41 
C) 42 
D) 41.9 
E) 75 
A) 33 
B) 41 
C) 42 
D) 41.9 
E) 75

Question 10

Which of the following elements is a halogen?

Accepted Answer

A) Ne 
B) I 
C) O 
D) Mg 
E) K 
A) Ne 
B) I 
C) O 
D) Mg 
E) K

Question 11

The number 6.022 × 1023 is known as ________.

Accepted Answer

Question 12

Which of the following elements is a gas at room temperature?

Accepted Answer

A) bromine 
B) carbon 
C) helium 
D) sodium 
A) bromine 
B) carbon 
C) helium 
D) sodium

Question 13

Bromine has two naturally occurring isotopes,Br-79 and Br-81.The mass of Br-79 is 78.92 u with a percent abundance of 50.69%.If the atomic mass of bromine is 79.904 u,calculate the mass and percent abundance of Br-81.

Accepted Answer

A) 80.916 u and 50.69% 
B) 78.921 u and 49.31% 
C) 79.904 u and 49.31% 
D) 80.916 u and 49.31% 
E) 80.028 u and 50.31% 
A) 80.916 u and 50.69% 
B) 78.921 u and 49.31% 
C) 79.904 u and 49.31% 
D) 80.916 u and 49.31% 
E) 80.028 u and 50.31%

Question 14

Which of the following elements is classified as a semimetal?

Accepted Answer

A) calcium 
B) boron 
C) fluorine 
D) uranium 
A) calcium 
B) boron 
C) fluorine 
D) uranium

Question 15

What species is represented by the following information? 
p+ = 17 n° = 18 e- = 18

Accepted Answer

A) Cl 
B) Cl- 
C) Ar 
D) Ar+ 
E) Kr 
A) Cl 
B) Cl- 
C) Ar 
D) Ar+ 
E) Kr

Question 16

Barium belongs to the ________ group of the periodic table.

Accepted Answer

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

Question 17

Which of the following statements is TRUE according to Dalton's atomic theory?

Accepted Answer

A) Atoms combine in simple fraction ratios to form compounds. 
B) All atoms of chlorine have identical properties to other elements with similar mass. 
C) Atoms of carbon can be changed into atoms of oxygen when creating carbon dioxide. 
D) Atoms of carbon do not change into another element during a chemical reaction with chlorine. 
E) An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of nitrogen. 
A) Atoms combine in simple fraction ratios to form compounds. 
B) All atoms of chlorine have identical properties to other elements with similar mass. 
C) Atoms of carbon can be changed into atoms of oxygen when creating carbon dioxide. 
D) Atoms of carbon do not change into another element during a chemical reaction with chlorine. 
E) An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of nitrogen.

Question 18

Identify the largest by size atom or ion of carbon.

Accepted Answer

A) p+ = 6 n° = 6 e- = 6 
B) p+ = 6 n° = 7 e- = 6 
C) p+ = 6 n° = 6 e- = 7 
D) p+ = 6 n° = 6 e- = 5 
A) p+ = 6 n° = 6 e- = 6 
B) p+ = 6 n° = 7 e- = 6 
C) p+ = 6 n° = 6 e- = 7 
D) p+ = 6 n° = 6 e- = 5

Question 19

How many electrons are in the ion P3-?

Accepted Answer

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

Question 20

Identify the description of an atom.

Accepted Answer

A) neutrons and electrons in nucleus; protons in orbitals 
B) neutrons in nucleus; protons and electrons in orbitals 
C) protons and neutrons in nucleus; electrons in orbitals 
D) protons and electrons in nucleus; neutrons in orbitals 
E) electrons in nucleus; protons and neutrons in orbitals 
A) neutrons and electrons in nucleus; protons in orbitals 
B) neutrons in nucleus; protons and electrons in orbitals 
C) protons and neutrons in nucleus; electrons in orbitals 
D) protons and electrons in nucleus; neutrons in orbitals 
E) electrons in nucleus; protons and neutrons in orbitals

Exam 2: Atoms and Elements

How many protons (p)and neutrons (n)are in an atom of 3890Sr{ } _ { 38 } ^ { 90 } \mathrm { Sr }3890​Sr ?

How many moles are in 2.16 × 1024 atoms of lead?

How many protons does the I- ion possess?

Calculate the atomic mass of element "X" if it has two naturally occurring isotopes with the following masses and natural abundances: X-45 \quad 44.8776 u \quad 32.88% X-47 \quad 46.9443 u \quad 67.12%

When forming an ion,fluorine,F,will ________ electron(s).

When forming an ion,calcium,Ca,will ________ electron(s).

How many atoms of chlorine are in 354.53 g of chlorine?

The mass number of an atom of 67Ga is ________.

How many protons are in arsenic?

Which of the following elements is a halogen?

The number 6.022 × 1023 is known as ________.

Which of the following elements is a gas at room temperature?

Bromine has two naturally occurring isotopes,Br-79 and Br-81.The mass of Br-79 is 78.92 u with a percent abundance of 50.69%.If the atomic mass of bromine is 79.904 u,calculate the mass and percent abundance of Br-81.

Which of the following elements is classified as a semimetal?

What species is represented by the following information? p+ = 17 n° = 18 e- = 18

Barium belongs to the ________ group of the periodic table.

Which of the following statements is TRUE according to Dalton's atomic theory?

Identify the largest by size atom or ion of carbon.

How many electrons are in the ion P3-?

Identify the description of an atom.

Units of Measurement for Physical and Chemical Change

Molecules,compounds,and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, valence Bond Theory, and Molecular Orbital Theory

Liquids, solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

How many protons (p)and neutrons (n)are in an atom of ${ } _ { 38 } ^ { 90 } \mathrm { Sr }$ ?

How many moles are in 2.16 × 10²⁴ atoms of lead?

How many protons does the I^-ion possess?

Calculate the atomic mass of element "X" if it has two naturally occurring isotopes with the following masses and natural abundances: X-45 $\quad$ 44.8776 u $\quad$ 32.88% X-47 $\quad$ 46.9443 u $\quad$ 67.12%

The mass number of an atom of ⁶⁷Ga is ________.

The number 6.022 × 10²³ is known as ________.

What species is represented by the following information? p⁺ = 17 n° = 18 e^- = 18

How many electrons are in the ion P^3-?