Chapter 2 Flashcards
The unit of mass is the
a. megabyte.
b. kg.
c. liter.
d. cc.
kg
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
negatively; 0.000548
The orderly arrangement of elements in the periodic table is based upon
a. atomic weights.
b. mass number.
c. neutron number.
d. atomic number.
atomic number
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.
inversely proportional to photon frequency
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.
The relationship between frequency and wavelength is direct and proportional
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
2n^2
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.
mass number
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.
represent elements with the same outer electron configuration
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.
8
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.
the principal quantum number
In the excitation process, electrons in an atom are moved to a/an ____ energy state.
a. lower
b. higher
c. incomplete
d. ionization
higher
The maximum number of electrons in a period with a principal quantum number of 4 is
a. 6.
b. 8.
c. 18.
d. 32.
32
. Isotopes have ____ mass numbers and ____ atomic numbers.
a. the same; the same
b. the same; different
c. different; the same
d. different; different
different; the same
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.
has a velocity equal to the speed of light
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.
wavelength will decrease to 1/10
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.
1.5 x 10^7 cm
The atomic number is the number of ____ contained in the nucleus.
a. neutrons
b. electrons
c. protons
d. positrons
protons
An isotope of boron has 5 protons and 6 neutrons. The atomic number of boron is
a. 11.
b. 10.
c. 6.
d. 5.
5
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
8
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
7.5 x 10^18 nm/sec
The nuclear components that distinguish one element from another are the
a. neutrons.
b. protons.
c. gamma particles.
d. beta particles.
protons
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
P = 18, N = 21
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.
50 m
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.
the valence shell is chemically inert
Which of the following is not a basic characteristic of the wave equation?
a. velocity
b. wavelength
c. frequency
d. energy
energy
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.
an ion
All of the following are energy forms EXCEPT
a. sound.
b. thermal.
c. electrical.
d. nuclear.
sound
Quarks may behave according to the ____ theory.
a. string
b. quantum
c. octet
d. electromagnetic
string
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.
it may be broken down into one atom of glucose
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.
iodine has five (5) orbitals with electrons
