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lJr nors ehe mistry -Ato ms fy [-l"me nts
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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Which statement below accurately describes the contributions of Dalton?
A) proposed the modern Atomic Theory
B) ancient Greek philosopher who proposed that matter was continuous
C) created the modem periodic table
D) discovered the existence of eiectrons
E) none of the above
2) \A4rich of the statements about the discovery of electrons is FALSE?
A) The negatively charged electron is located outside the nucleus.
B) Because atoms are neutral, the existence of a negatively charged particle implied there must be a
positively charged component of an atom.
C) Thomson proposed that electrons were small particles held within a positively charged sphere.
D) Rutherford proved the plum-pudding model correct.
E) All of the above statements are true.
3) The Rutherford goid foil experiment demonstrated that atoms
A) are visible to the naked eye.
B) consist of a dense nucleus surrounded by mostly empty space.
C) are homogeneous.
D) consist of a single type of subatomic particle.
E) consist of an almost empty nucleus surrounded by a dense cloud of electrons.
4) \Mhich of the following pairs of subatomic particles have charges of equal magnitude but opposite in sign?
A) proton and electron
B) gamma ray and neutron
C) neutron and proton
D) proton and positron
E) electron and neutron
5) The correct symbol for the isotope of potassium with22 neutrons is
19
nr'41
t<
..K
'19
i1
R}
22x
ct'19
15
D)'"P
J/
aa
E)"P
'15
6) The correct symbol for a uranium atom with a mass number of 235 is
??q
A);;U
qTf"
327
ct'92
u
-"- IIr
D),9?
i43
'92 u
Er
7
7) How many electrons are in Br-?
A)4
B) 34
c)36
D)7
E) none of the above
8) Which of the following is NOT true for the atoms 131q, 145, and 15N?
A) They all have 7 protons.
B) They all have 7 electrons.
C) They are isotopes.
D) They all have the same mass number.
E) They all have the same atomic number.
9) Vfhich of the statements about light is FALSE?
A) A characteristic feature of light that determines its color is its wavelength.
B) Light travels through space at a speed of 3.00
C) Light travels much faster than sound.
D) A packet of light energy is called a photon.
E) A11 of the above statements are true.
,
108 m/s.
10) The number of cycles of a wave that passes a stationary point in one second is called its
A) wavelength
B) frequency
C) trough
D) crest
E) none of the above
11) \A4rich color of the visible spectrum has the longest wavelength (750 nm)?
A)yellow
B)
violet
C)
orange
D)
green
E) red
12) What is the correct order of the electromagnetic spectrum from shortest wavelength to longest?
A) Gamma Rays-X-rays-Visible Light-Ultraviolet Radiation-Infrared Radiation--Microwaves--Radio
Waves
B) Gamma Rays-X-rays-Ultraviolet Radiation-Visible Light-Infrared Radiation-Microwaves-Radio
Waves
C) Visible Light-Infrared Radiation-Microwaves-Radio Waves-Gamma Rays--X-rays-Ultraviolet
Radiation
D) Radio Waves-X-rays-Ultraviolet Radiation-Visible Light-Infrared Radiation-Microwaves-Gamma
Rays
E) Camma
Waves
Rays-X-rays-lnfrared Radiation-Visible Light-Ultraviolet Radiation-Microwaves-Radio
13) V\hat is the frequency (Hz) of electromagnetic radiation that has a wavelength of 0.53 m?
A) 5.2 ,
108
B) 1.8 *
10-9
C) 1.3
, tg33
D) 1.6 "
108
14)Theenergyofaphotonthathasafrequencyof8'21'1015Hzis-I.
A) s.os , 10-50
B) Lz6, 10-19
C) 5.44, 10-18
D) 7.24,1049
E) 1.3
, 10-33
E) 7.99
,70-25
white light is passed through a prism, what is observed?
A) continuous spectrum
B) black light
C) bright spots and lines
D)nothing
15) \A4ren
E) none of the above
16) What happens to an atom when
it absorbs energy?
A) The atom re-emits the energy
B)
C)
D)
E)
heat.
of the electrons in their orbitals
speed
The extra energy increases the
The atom re-emits the energy as light.
The atom stores the energy for later use.
none of the above
17) The atomic
as
orbital depicted below would be found in
sublevel.
a
A)
c) 4f
B) 2s
6p
D) 5d
18) V\4rich electron configuration represents a violation of the Pauli exclusion principie?
A)
ls
Lb
t;; 6il
l,1l l'*l
lt!t
B)
c)
D)
E)
n m flal il
1s
?s
2p
ls
2s
2p
ru
f;;
1s
il
t;;
l,ti
t^
2s
m
tl
I
I
Li*Y_l
[;
tlgJ
t
T
2p
TT
E) 3p
19) lA4rich of the
following denotes an orbital diagram for a boron atom?
A)
tis
1*
tll
[?TJ
B)
't^
l:3
c)
l.*
m
1x
? iTT
2p
ffit
l_'l
?trtr
3s
?p
ru ?ilfI?
r*l**-1
tT J
?p
I
D)
lx
t;**l
rul lll
E)
?e
?s
3p
ru
IITJ
T
20) The electron configuration of Ga is
X1 rc2
Z
s2 Zp6
Y2 3 p6
B) [Ar]4s23411
C) rc2 z s2 zpQ s2 3pQ
D)
E)
_.
4s2 441 0 4p 1
4.70 4s2
4p1
t s2 Z s2 3 s2 3 p6 g 670 42 4r7
7
s2
Z
grfu 6,1 0 4t2 46,1
s2 Zp6 g
"2
21) What is the electron configuration for potassium (atomic number 19)?
A) 1s2 2s2 2p6 352 3p5 342
B) 7s2 Zs2 2p8 3s2 3pS
C) ts2 2s2 2p6 352 gp6 4s1'
D) 7s2 2s2 2p6 3s2 3p7
E) U2 Zs2 2p6 3e2 3p 5 4s1
22) What element has the electron configuratio
B) Be
A) Na
n
1s2 2s2 2p6 3s2 z
c) si
D)Mg
E) Ca
23) The correct electron configuration for chromium is
A) 7s2zs2zp6Y2gp@46
B) ts2Zs2Zp63s23p6
C)
7
D)
t s2 2s2 Zp6
s2
Z
s2
zp6 Y2 3p6 4s2 3 64
Y23 p6 42
3 d10
4p1
El7s2Zs2zpQs2
24) Vfhich of the
following electron configurations is incorrecf as written?
x1 ts2zs2zp6zr2zp6
B)
7
sz 2 s2
2p6 z rz z p6 z d7o
c) k22s22p63s2
o7 l s2 zs2 zp *2
E)
k2
2s2 2p6
2p
z 12
12
2p *2
3
12
zp6 +r2 z dlo +p4
25) How many valence electrons are in a bromine atom?
A)
B)
17
i
c)10
D)7
E) none of the above
Answer Key
Testname: HONORS CHEMISTRY - ATOMS & ELEMENTS PRACTICE EXAM
1)A
2)D
3)B
4)A
5)B
6) B
7)C
8) D
e) E
10) B
11) E
72) B
13) A
14) C
15)
A
16) C
17)D
18) A
1e) E
20)
c
21) C
22)D
23) C
24) B
25)D