Accounting
Anthropology
Archaeology
Art History
Banking
Biology & Life Science
Business
Business Communication
Business Development
Business Ethics
Business Law
Chemistry
Communication
Computer Science
Counseling
Criminal Law
Curriculum & Instruction
Design
Earth Science
Economic
Education
Engineering
Finance
History & Theory
Humanities
Human Resource
International Business
Investments & Securities
Journalism
Law
Management
Marketing
Medicine
Medicine & Health Science
Nursing
Philosophy
Physic
Psychology
Real Estate
Science
Social Science
Sociology
Special Education
Speech
Visual Arts
Chemistry
Q:
The process by which a large nucleus breaks into smaller pieces, releasing large amounts of energy is called nuclear ________.
Q:
The diagnostic imaging technique that depends on magnetic fields and radio waves, not radioactivity, is called ________.
Q:
The radioisotope used as a diagnostic tool to measure thyroid function is ________.
Q:
The time needed for a radioactive sample to decay to one-half of its original activity is called the ________.
Q:
The common unit of radioactivity which is used to measure the biological damage is the ________.
Q:
A sample of phosphorus-32 with an activity of 2.0 mCi produces ________ disintegrations per second.
(1 Ci = 3.7 1010 disintegrations/sec).
Q:
The radiation dose required to produce death in one-half of the exposed subject animals is termed the ________.
Q:
Sr -> ________ + e + energy
Q:
U + n -> ________ + Kr + 3n + energy
Q:
Tc -> Tc + ________
Q:
One symbol for the particle is . Another symbol for the same particle is ________.
Q:
In the Sun, nuclei of hydrogen combine to form a larger nucleus and release a great amount of energy. The process is known as
A) fission.
B) fusion.
C) metathesis.
D) chain reaction.
E) ionization.
Q:
Classify the following elements as metals, nonmetals or metalloids.
A) metalloid
B) nonmetal
C) metal
1> chlorine
2> cobalt
3> sulfur
4> silicon
5> nickel
Q:
Classify the following elements.
A) halogen
B) alkaline earth metal
C) alkali metal
D) noble gas
E) nonmetal
F) transition element
1> sodium
2> argon
3> bromine
4> copper
5> magnesium
6> phosphorus
Q:
Give the correct number of electrons.
A) seven
B) five
C) eight
D) one
E) two
1> in the second energy level of magnesium
2> in the highest occupied energy level of chlorine
3> in the outer energy level of nitrogen
4> in the first energy level of chlorine
5> in the third energy level of sodium
Q:
Match the correct symbols with the names of elements.
A) Co
B) Cl
C) C
D) Ca
E) Cu
1> calcium
2> copper
3> carbon
4> chlorine
5> cobalt
Q:
Do the following represent elements in a group, a period, or neither?
A) period
B) group
C) neither
1> Li, C, F
2> F, S, P
3> O, S, Se
4> He, H, I
Q:
Chlorine has more metallic character than fluorine.
Q:
Atomic size decreases going from left to right within a period.
Q:
Ionization energy increases going down a group.
Q:
Chlorine has a higher ionization energy than fluorine.
Q:
Chlorine has a higher ionization energy than aluminum.
Q:
A sodium atom is larger than a silicon atom.
Q:
A lithium atom is larger than a potassium atom.
Q:
The electron configuration of potassium is 1s22s22p63s1.
Q:
Potassium has one valence electron.
Q:
Isotopes have the same atomic number but different mass numbers.
Q:
Sulfur has 16 valence electrons.
Q:
Protons and neutrons are located in the nucleus of an atom.
Q:
An electron has a positive charge.
Q:
Iodine is a metal.
Q:
Mercury is a metal.
Q:
Radon is a metal.
Q:
Chromium is a metal.
Q:
Sulfur is a nonmetal.
Q:
The symbol for gold is Au.
Q:
The symbol for potassium is P.
Q:
Write in the electronic configuration for the atom shown.
1> Sodium
2> Chlorine
3> Argon
4> Sulfur
5> Magnesium
6> Phosphorus
Q:
Of the elements: B, C, F, Li, and Na. The element with the least metallic character is
A) B.
B) C.
C) F.
D) Li.
E) Na.
Q:
Of the elements: B, C, F, Li, and Na. The element with the most metallic character is
A) B.
B) C.
C) F.
D) Li.
E) Na.
Q:
Of the elements: B, C, F, Li, and Na. The element with the smallest ionization energy is
A) B.
B) C.
C) F.
D) Li.
E) Na.
Q:
Ionization energy is
A) the energy an ion acquires from an electron.
B) the energy needed to remove the least tightly bound electron.
C) highest for metals in Group 1A (1).
D) higher for potassium than for lithium.
E) None of the above.
Q:
Of the elements: B, C, F, Li, and Na. The element with the highest ionization energy is
A) B.
B) C.
C) F.
D) Li.
E) Na.
Q:
Of the elements: B, C, F, Li, and Na, the element with the smallest atomic radius is
A) B.
B) C.
C) F.
D) Li.
E) Na.
Q:
Of the elements: B, C, F, Li, and Na., the element with the largest atomic radius is
A) B.
B) C.
C) F.
D) Li.
E) Na.
Q:
The ionization energy of atoms
A) decreases going across a period.
B) decreases going down within a group.
C) increases going down within a group.
D) does not change going down within a group.
E) None of the above.
Q:
The atomic size of atoms
A) increases going across a period.
B) decreases going across a period.
C) decreases going down within a group.
D) does not change going across a period.
E) None of the above.
Q:
Which of the following is the correct electron-dot structure for carbon?A)B)C)D)E)
Q:
The number of dots in the electron dot structure of carbon is
A) one.
B) two.
C) three.
D) four.
E) five.
Q:
The number of dots in the electron dot structure of nitrogen is
A) one.
B) two.
C) three.
D) four.
E) five.
Q:
How many valence electrons are in the electron-dot structures for the elements in group 3A(13)?
A) 1
B) 2
C) 3
D) 4
E) 6
Q:
In an electron-dot structure of an element, the dots are used to represent
A) all of the electrons in the atom.
B) the valence electrons.
C) the electron arrangement.
D) only the electrons that will participate in bond formation.
E) the electrons that the element will gain when it forms a compound.
Q:
Valence electrons are electrons located
A) in the outermost energy level of an atom.
B) in the nucleus of an atom.
C) in the innermost energy level of an atom.
D) throughout the atom.
E) in the first three shells of an atom.
Q:
The number of valence electrons found in an atom of a Group A element is equal to
A) its atomic number.
B) its mass number.
C) its group number.
D) eight.
E) eight minus the group number.
Q:
What is the element with the abbreviated electron configuration [Kr]5s24d8?
A) Ni
B) Pd
C) Pt
D) Kr
E) Xe
Q:
What is the abbreviated electron configuration for nickel (atomic number 28)?
A) [He]2s22p3
B) [Ar]4s23d8
C) [Kr]4s23d8
D) [Ar]4s24p4
E) [Ar]3d8
Q:
What is the correct electron configuration for the lithium atom?
A) 1s3
B) 2s1
C) 1s12s2
D) 1s22s1
E) 1s22s5
Q:
The number of electrons in the outer energy level of a neutral atom of boron (atomic number 5) is
A) 2.
B) 3.
C) 5.
D) 8.
E) 10.
Q:
What element has the electron configuration 1s22s22p63s23p2?
A) carbon
B) oxygen
C) sulfur
D) iron
E) silicon
Q:
What is the electron configuration for potassium (atomic number 19)?
A) 1s22s22p63s23p7
B) 1s22s22p6 3s23p53d2
C) 1s22s22p83s23p5
D) 1s22s22p63s23p64s1
E) 1s22s22p63s23p54s1
Q:
Which of the following electron configurations is impossible?
A) 1s22s22p63s23p1
B) 1s22s42p63s23p3
C) 1s22s22p63s23p5
D) 1s22s22p63s23p6
E) 1s22s22p63s23p3
Q:
What is the electron configuration for aluminum?
A) 1s22s22p63s23p1
B) 1s22s22p63s23p3
C) 1s22s22p63s23p5
D) 1s22s22p63s23p6
E) 1s22s22p63s23p8
Q:
What is the element with the electron configuration 1s22s22p63s23p5?
A) Be
B) Cl
C) F
D) S
E) Ar
Q:
The maximum number of electrons that may occupy the third energy level is
A) 2.
B) 8.
C) 10.
D) 18.
E) 32.
Q:
The number of electron levels in a magnesium atom is
A) 1.
B) 2.
C) 3.
D) 4.
E) 5.
Q:
The electron arrangement of any particular atom shows
A) the number of isotopes possible.
B) a description of the shape of each energy level.
C) the number of electrons in each energy level.
D) a diagram of an atomic nucleus.
E) the maximum number of electrons each energy level can hold.
Q:
The elements sodium, magnesium, and silicon
A) are isotopes of each other.
B) are in the same period of elements.
C) have the same number of neutrons.
D) are in the same group.
E) have the same mass number.
Q:
The elements lithium, sodium, and potassium
A) are isotopes of each other.
B) are in the same period of elements.
C) have the same number of neutrons.
D) are in the same group.
E) have the same mass number.
Q:
Which of the following is NOT true for the atoms 13N, 14N, and 15N?
A) They all have the same mass number.
B) They are isotopes.
C) They all have the same atomic number.
D) They all have 7 protons.
E) They all have 7 electrons.
Q:
A sample of silicon has three naturally occurring isotopes: Si-28 (mass 28.0 amu); Si-29 (mass 29.0 amu) and Si-30 (mass = 30.0 amu). If the average atomic mass of silicon is 28.1 amu, which isotope is the most abundant?
A) Si-28
B) Si-29
C) Si-30
D) All isotopes have the same natural abundance.
Q:
A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 (mass 35.0 amu) makes up 75.8% of the sample, and the isotope Cl-37 (mass = 37.0 amu) makes up 24.3% of the sample. What is the average atomic mass for chlorine?
A) 36.0 amu
B) 35 amu
C) 36.6 amu
D) 35.5 amu
E) 35.521 amu
Q:
The atomic mass of an element is equal to
A) its mass number.
B) its atomic number.
C) one-twelfth of the mass of a carbon-12 atom.
D) a weighted average mass of all of the naturally occurring isotopes of the element.
E) the average mass of all of the naturally occurring isotopes of the element.
Q:
Given the following: X, X, X, and X. Which are isotopes of each other?
A) X andX are isotopes of each other; and X and X are isotopes of each other.
B) X and X are isotopes of each other.
C) X, X, X, and X are isotopes of each other.
D) None are isotopes of each other.
Q:
The correct symbol for the isotope of potassium with 22 neutrons is
A) K.
B) K.
C) P.
D) P.
E) K.
Q:
Isotopes are atoms of the same element that have
A) different atomic numbers.
B) the same atomic numbers but different numbers of protons.
C) the same atomic numbers but different numbers of electrons.
D) the same atomic number but different numbers of neutrons.
E) the same atomic mass but different numbers of protons.
Q:
Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom of Sn?
A) 118 protons, 50 neutrons, 118 electrons
B) 118 protons, 118 neutrons, 50 electrons
C) 50 protons, 68 neutrons, 50 electrons
D) 68 protons, 68 neutrons, 50 electrons
E) 50 protons, 50 neutrons, 50 electrons
Q:
Consider an isotope of sodium with a mass number of 25. The number of neutrons in this isotope of sodium is
A) 11.
B) 14.
C) 16.
D) 25.
E) 32.
Q:
How many protons are in an isotope of sodium with a mass number of 25?
A) 11
B) 14
C) 15
D) 25
E) 32
Q:
Consider a neutral atom with 30 protons and 34 neutrons. The number of electrons in this atom is
A) 30.
B) 32.
C) 34.
D) 64.
E) 94.
Q:
Consider a neutral atom with 30 protons and 34 neutrons. The mass number for this atom is
A) 30.
B) 32.
C) 34.
D) 64.
E) 94.