Question 1

Why do elements in the same group tend to have similar chemical properties?

Accepted Answer

Since elements in the same group have th

Question 2

Determine the number of protons,neutrons and electrons in the following: 
  X

Accepted Answer

A) p+ = 18 n° = 18 e- = 22 
B) p+ = 18 n° = 22 e- = 18 
C) p+ = 22 n° = 18 e- = 18 
D) p+ = 18 n° = 22 e- = 40 
E) p+ = 40 n° = 22 e- = 18 
A) p+ = 18 n° = 18 e- = 22 
B) p+ = 18 n° = 22 e- = 18 
C) p+ = 22 n° = 18 e- = 18 
D) p+ = 18 n° = 22 e- = 40 
E) p+ = 40 n° = 22 e- = 18

Question 3

Which of the following elements is an actinide?

Accepted Answer

A) U 
B) Pm 
C) Rf 
D) Po 
A) U 
B) Pm 
C) Rf 
D) Po

Question 4

In which of the following sets do all species have the same number of protons?

Accepted Answer

A) F-,Ne,Mg2+ 
B) Ge,Se2-,Br- 
C) K+,Rb+,Cs+ 
D) Br,Br-,Br+ 
A) F-,Ne,Mg2+ 
B) Ge,Se2-,Br- 
C) K+,Rb+,Cs+ 
D) Br,Br-,Br+

Question 5

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

Accepted Answer

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

Question 6

Which one of the following elements is a poor conductor of heat and electricity?

Accepted Answer

A) copper 
B) fluorine 
C) iron 
D) lead 
A) copper 
B) fluorine 
C) iron 
D) lead

Question 7

Which of the following elements is an alkali metal?

Accepted Answer

A) Zn 
B) Xe 
C) F 
D) Li 
E) Ca 
A) Zn 
B) Xe 
C) F 
D) Li 
E) Ca

Question 8

Which are isotopes? 
An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has

Accepted Answer

A) an atomic number of 21 and a mass number of 42. 
B) an atomic number of 20 and a mass number of 40. 
C) 22 neutrons and 20 protons. 
D) 22 protons and 20 neutrons. 
A) an atomic number of 21 and a mass number of 42. 
B) an atomic number of 20 and a mass number of 40. 
C) 22 neutrons and 20 protons. 
D) 22 protons and 20 neutrons.

Question 9

The mass number of an atom of 128Xe is ________.

Accepted Answer

A) 54 
B) 182 
C) 74 
D) 128 
E) 120 
A) 54 
B) 182 
C) 74 
D) 128 
E) 120

Question 10

Which of the following elements is an alkaline earth metal?

Accepted Answer

A) Cs 
B) Cu 
C) Mg 
D) Ti 
E) Br 
A) Cs 
B) Cu 
C) Mg 
D) Ti 
E) Br

Question 11

How many protons does the Br- ion possess?

Accepted Answer

A) 34 
B) 36 
C) 6 
D) 8 
E) 35 
A) 34 
B) 36 
C) 6 
D) 8 
E) 35

Question 12

How many protons (p)and neutrons (n)are in an atom of barium-130?

Accepted Answer

A) 56 p,74 n 
B) 56 p,130 n 
C) 74 p,56 n 
D) 130 p,56 n 
A) 56 p,74 n 
B) 56 p,130 n 
C) 74 p,56 n 
D) 130 p,56 n

Question 13

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

Accepted Answer

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

Question 14

Determine the number of protons,neutrons and electrons in the following: 
  X

Accepted Answer

A) p+ = 12 n° = 25 e- = 12 
B) p+ = 12 n° = 12 e- = 13 
C) p+ = 12 n° = 13 e- = 12 
D) p+ = 25 n° = 12 e- = 13 
E) p+ = 12 n° = 13 e- = 25 
A) p+ = 12 n° = 25 e- = 12 
B) p+ = 12 n° = 12 e- = 13 
C) p+ = 12 n° = 13 e- = 12 
D) p+ = 25 n° = 12 e- = 13 
E) p+ = 12 n° = 13 e- = 25

Question 15

Predict the charge of the most stable ion of potassium.

Accepted Answer

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

Question 16

Rutherford's gold foil experiment and results are given in the following figure (Rutherford's Gold Foil Experiment: Rutherford directed alpha particles at a thin sheet of gold foil.Most of the particles passed through the foil,but a small fraction was deflected,and a few even bounced backward. )(Figure 2.6,page 51;Tro P3e).
Which of the following statements best explains the experimental results?

Accepted Answer

A) Positively and negatively charged particles are uniformly distributed in the atom. 
B) Most of the atom's mass and all of its negative charge are contained in a small core. 
C) Most of the atom's mass and all of its positive charge are contained in a small core. 
D) All of the atom's mass and all of its positive and negative charges are contained in a small core. 
A) Positively and negatively charged particles are uniformly distributed in the atom. 
B) Most of the atom's mass and all of its negative charge are contained in a small core. 
C) Most of the atom's mass and all of its positive charge are contained in a small core. 
D) All of the atom's mass and all of its positive and negative charges are contained in a small core.

Why do elements in the same group tend to have similar chemical properties?

Determine the number of protons,neutrons and electrons in the following: X

Which of the following elements is an actinide?

In which of the following sets do all species have the same number of protons?

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

Which one of the following elements is a poor conductor of heat and electricity?

Which of the following elements is an alkali metal?

Which are isotopes? An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has

The mass number of an atom of ¹²⁸Xe is ________.

Which of the following elements is an alkaline earth metal?

How many protons does the Br^- ion possess?

How many protons (p)and neutrons (n)are in an atom of barium-130?

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

Determine the number of protons,neutrons and electrons in the following: X

Predict the charge of the most stable ion of potassium.

Matter, Measurement, and Problem Solving

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

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

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Filters

Exam 2: Atoms and Elements

Why do elements in the same group tend to have similar chemical properties?

Determine the number of protons,neutrons and electrons in the following: X

Which of the following elements is an actinide?

In which of the following sets do all species have the same number of protons?

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

Which one of the following elements is a poor conductor of heat and electricity?

Which of the following elements is an alkali metal?

Which are isotopes? An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has

The mass number of an atom of 128Xe is ________.

Which of the following elements is an alkaline earth metal?

How many protons does the Br- ion possess?

How many protons (p)and neutrons (n)are in an atom of barium-130?

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

Determine the number of protons,neutrons and electrons in the following: X

Predict the charge of the most stable ion of potassium.

Matter, Measurement, and Problem Solving

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

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

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Filters

The mass number of an atom of ¹²⁸Xe is ________.

How many protons does the Br^- ion possess?

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