Chapter 2

Question 1

The unit of mass is the
a. megabyte.
b. kg.
c. liter.
d. cc.

Answer 1

kg

Question 2

An electron is ____ charged and has a mass of ____ amu(s).
a. negatively; 1.673 10−27
b. negatively; 0.000548
c. neutral; 1
d. positively; 0.000548

Answer 2

negatively; 0.000548

Question 3

The orderly arrangement of elements in the periodic table is based upon
a. atomic weights.
b. mass number.
c. neutron number.
d. atomic number.

Answer 3

atomic number

Question 4

Photon wavelength is
a. inversely proportional to photon velocity.
b. directly proportional to photon frequency.
c. inversely proportional to photon frequency.
d. is not related to frequency.

Answer 4

inversely proportional to photon frequency

Question 5

All of the following are true of electromagnetic energies EXCEPT:
a. They are illustrated as sinusoidal waves.
b. They possess both wave and particle characteristics.
c. The relationship between frequency and wavelength is direct and proportional.
d. They are arranged in an orderly spectrum according to frequency and wavelength.

Answer 5

The relationship between frequency and wavelength is direct and proportional

Question 6

The maximum number of electrons found in any energy level (shell) at any point in time is calculated by the formula
a. N = Z x e2.
b. W = F D.
c. N = amu Z.
d. 2n^2

Answer 6

2n^2

Question 7

The sum of protons and neutrons in a nucleus is called the
a. atomic mass unit.
b. atomic weight.
c. quantum number.
d. mass number.

Answer 7

mass number

Question 8

Groups of the periodic table
a. represent elements with the same outer electron configuration.
b. are horizontal.
c. represent elements with the same atomic density.
d. all have the same electron binding energies.

Answer 8

represent elements with the same outer electron configuration

Question 9

Carbon has an atomic number of 6. One of its isotopes has a mass number of 14. The number of neutrons in this isotope is
a. 6.
b. 8.
c. 14.
d. 19.

Answer 9

8

Question 10

A period in the periodic table is
a. represented by a column.
b. vertical.
c. the principal quantum number.
d. determined by the valence electrons.

Answer 10

the principal quantum number

Question 11

In the excitation process, electrons in an atom are moved to a/an ____ energy state.
a. lower
b. higher
c. incomplete
d. ionization

Answer 11

higher

Question 12

The maximum number of electrons in a period with a principal quantum number of 4 is
a. 6.
b. 8.
c. 18.
d. 32.

Answer 12

32

Question 13

. Isotopes have ____ mass numbers and ____ atomic numbers.
a. the same; the same
b. the same; different
c. different; the same
d. different; different

Answer 13

different; the same

Question 14

In a vacuum, electromagnetic radiation
a. has a velocity equal to the speed of light.
b. x-ray energy may be bent by a crystalline lens.
c. causes ionizations of air molecules.
d. is altered by a strong magnetic field.

Answer 14

has a velocity equal to the speed of light

Question 15

If the photon frequency of electromagnetic radiation is increased tenfold, then the
a. velocity will increase times 10.
b. velocity will decrease to 10.
c. wavelength will increase times 10.
d. wavelength will decrease to 1/10.

Answer 15

wavelength will decrease to 1/10

Question 16

Electromagnetic radiation with a frequency of 2,000 hertz would have a wavelength of
a. 1/2,000 cm.
b. 1.5 10−7 cm.
c. 1.5 107 cm.
d. cannot be determined.

Answer 16

1.5 x 10^7 cm

Question 17

The atomic number is the number of ____ contained in the nucleus.
a. neutrons
b. electrons
c. protons
d. positrons

Answer 17

protons

Question 18

An isotope of boron has 5 protons and 6 neutrons. The atomic number of boron is
a. 11.
b. 10.
c. 6.
d. 5.

Answer 18

5

Question 19

An element with an atomic number of 22 has how many electrons in the second principal quantum number level (L shell)?
a. 22
b. 10
c. 8
d. 2

Answer 19

8

Question 20

Calculate the velocity of red light with a wavelength of approximately 4.0 nm (nm = 10−9).
a. 7.5 10^−1 nm/sec
b. 7.5 10^18 nm/sec
c. 1.2 10^−17 nm/sec
d. 1.2 10^1 nm/sec

Answer 20

7.5 x 10^18 nm/sec

Question 21

The nuclear components that distinguish one element from another are the
a. neutrons.
b. protons.
c. gamma particles.
d. beta particles.

Answer 21

protons

Question 22

An atom has an atomic number of 18 and a mass number of 38. Letting P = the number of protons and N = the number of neutrons, which of the following atoms is the isotope of this atom?
a. P = 18, N = 20
b. P = 18, N = 21
c. P = 20, N = 18
d. none of the above

Answer 22

P = 18, N = 21

Question 23

If the frequency of a wave is 1,000 hertz and is traveling at 50,000 m/sec, then its wavelength is
a. 0.05 m.
b. 0.5 m.
c. 5 m.
d. 50 m.

Answer 23

50 m

Question 24

According to the “rule of octets,”
a. eight energy levels have electrons.
b. eight protons occupy the outermost shell.
c. the valence shell is chemically inert.
d. both a and c.

Answer 24

the valence shell is chemically inert

Question 25

Which of the following is not a basic characteristic of the wave equation?
a. velocity
b. wavelength
c. frequency
d. energy

Answer 25

energy

Question 26

If an electron is gained or lost from an atom, that atom becomes
a. an ion.
b. a new element.
c. an isotope.
d. radioactive.

Answer 26

an ion

Question 27

All of the following are energy forms EXCEPT
a. sound.
b. thermal.
c. electrical.
d. nuclear.

Answer 27

sound

Question 28

Quarks may behave according to the ____ theory.
a. string
b. quantum
c. octet
d. electromagnetic

Answer 28

string

Question 29

All of the following are true of the substance glucose (C6H12O6) EXCEPT:
a. The smallest subdivision of this molecule is glucose.
b. It is a compound.
c. It consists of three elements.
d. It may be broken down into one atom of glucose.

Answer 29

it may be broken down into one atom of glucose

Question 30

When comparing iodine (Z = 53) with barium (Z = 56),
a. barium has a lower k-shell binding energy.
b. iodine has more neutrons.
c. iodine has five (5) orbitals with electrons.
d. barium has fewer protons.

Answer 30

iodine has five (5) orbitals with electrons