Page 100 - Chemistry eBook

d m
e e
e
ie ao ie
a
o
y
55
foil experi
utrons, and nse nucleus
rbitals sphere
ribes the di
s surround rged electr s surround rged electro d nucleus is
tively charg d nucleus is itively charg
und state h most energ
(3) Li (4) Na
least mass?
(3) neutr (4) proto
ment, it was electrons
stribution of
d by one or ns.
d by one or ns.
surrounded ed electrons. surrounded ed electrons.
as an outer-
mation about
(1) mass number, only
(2) atomic number, only
?
e
Choice #2
10
Which pair represents two forms of an element in the same phase at STP but with different structures and different properties?
(1) I2(s) and I2(g) (3) H2(g) and Hg(g) (2) O2(g) and O3(g) (4) H2O(s) and H2O(l)
The elements on the Periodic Table are arranged in order of increasing
11
12
Jan 2012 #10
(3) both mass number and atomic number
Sample Regents Questions
(4) neither mass number nor atomic number
(1) atomic mass (2) atomic number
What is the IUPAC ZnO?
(1) zinc oxide (2) zinc oxalate
A
(3) molar mass
(4) oxidation number
for the compound
(3) zinc peroxide (4) zinc hydroxide
Explanation: Choice 2 is the correct answer because it shows two different forms of O in the same phase.
n
er
n
a
s
w
m
n
13 Which atom attains a stable valence electron configuration by bonding with another atom?
Wrong answers explained:
(1) neon (3) helium
Choice 1 and 4 show elements in different phases.
(2) radon (4) hydrogen
Choice 3 shows two different elements (H and Hg).
[2]
o n
100 © UNIT 3: PERIODIC TABLE OF ELEMENTS