Section 2.2
Electrons in Atoms
Practice Test
1.
The distance between corresponding points on two consecutive waves is called _____________.
a.
amplitude
b.
frequency
c.
speed
d.
wavelength
Hint
2.
This color of light has the highest frequency of the visible electomagnetic spectrum.
a.
blue
b.
green
c.
red
d.
violet
Hint
3.
An element's emission spectrum is thought to be produced when electrons move from _____________.
a.
higher to lower energy levels
b.
inside the atom to outside the atom
c.
lower to higher energy levels
d.
the nucleus to energy levels
Hint
4.
When an atom absorbs energy that causes one of its electrons to move to a higher energy level, the atom is said to be in _____________.
a.
an excited state
b.
the ground state
c.
the nucleus
d.
an outer orbit
Hint
5.
An atom's valence electrons are those in its ___________.
a.
electron clouds
b.
inner energy levels
c.
lowest energy level
d.
outermost energy level
Hint
6.
A magnesium atom has _______ valence electron.
a.
two
b.
three
c.
four
d.
five
Hint
7.
This element is in period two of the periodic table and has four dots in its Lewis dot diagram.
a.
carbon
b.
beryllium
c.
neon
d.
oxygen
Hint
8.
The nucleus of this atom contains nine protons and nine neutrons.
a.
fluorine-18
b.
oxygen-18
c.
neon-18
d.
nitrogen-19
Hint
9.
Lavoisier came to the conclusion that air is a mixture made up mostly of these two gases.
a.
nitrogen and oxygen
b.
oxygen and carbon dioxide
c.
hydrogen and oxygen
d.
oxygen and methane
Hint
10.
The weighted average mass of all of an element's naturally occurring isotopes is the element's ________________.
a.
atomic mass
b.
atomic number
c.
mass number
d.
symbol
Hint
11.
This isotope is often used to date prehistoric fossils.
a.
calcium-40
b.
carbon-14
c.
oxygen-16
d.
uranium-235
Hint
12.
This scientist compared the the motions of electrons in atoms to the motions of planets orbiting the sun.
a.
Bohr
b.
Priestly
c.
Rutherford
d.
Thomson
Hint
13.
What is the frequency of yellow light , which has a wavelength of 5.56 x 10 -7 m?
a.
1.85 x 10 15 Hz
b.
1.85 x 10 15 m/s
c.
5.40 x 10 14 Hz
d.
5.40 x 10 14 m/s
Hint
14.
What is the wavelength of a radio wave having a frequency of 3.75 x 10 7 Hz?
a.
.08 m
b.
0.8 m
c.
8.0 m
d.
80 m
Hint
15.
What is the maximum number of electrons that can be present in each principal energy level of hydrogen?
a.
n
b.
n 2
c.
2n
d.
2n 2
Hint
16.
What is the wavelength of an object moving at 19.4 m/s and having a mass of 1000 kg?
a.
1.3 x 10 -38 m
b.
3.4 x 10 -38 m
c.
3.4 x 10 -34 m
d.
34 m
Hint
