Transcript Document

CHEMISTRY DEPARTMENT
WAID ACADEMY
Trends in the
Periodic Table
25
The difference in atomic size of
sodium and chlorine is mainly
due to the difference in the
at
om
.
ea
of
as
s
0%
ch
s.
ro
fn
m
be
nu
nu
m
be
ro
fp
ro
to
n
tr
on
s
le
c
ro
fe
m
be
0%
eu
tr
on
s.
0%
.
0%
m
number of electrons.
number of protons.
number of neutrons.
mass of each atom.
nu
1.
2.
3.
4.
25
In which molecule will the chlorine
atom carry a partial positive charge?
Cl-Br
Cl-Cl
Cl-I
Cl-F
l-F
0%
C
l-I
0%
C
l-C
l
0%
C
l-B
r
0%
C
1.
2.
3.
4.
Which description shows the trends
in the electronegativity values of
elements in the Periodic Table?
...
pe
ri.
.
D
ec
re
a
a
se
ac
ac
ro
ss
ro
s
s
a
pe
a
In
cr
ea
se
ac
ro
ss
se
cr
ea
In
pe
ri.
.
...
pe
a
s
ro
s
ac
se
4.
0% 0% 0% 0%
re
a
3.
ec
2.
Decrease across a period and
increase down a group.
Increase across a period and
increase down a group.
Increase across a period and
decrease down a group.
Decrease across a period and
decrease down a group.
D
1.
30
Which of the following chlorides is
likely to have the most ionic
character?
LiCl
CsCl
BeCl2
CaCl2
aC
l2
0%
C
eC
l2
0%
B
sC
l
0%
C
Cl
0%
Li
1.
2.
3.
4.
30
Which equation represents the first
ionisation energy of a diatomic
element, X2?
1.
2.
3.
4.
½ X2(s)  X+(g) + e½ X2(s) + e-  X-(g)
X(g)  X+(g) + eX(g) + e-  X-(g)
30
30
Which of the following elements has
the greatest electronegativity?
Fluorine
Caesium
Iodine
Sodium
di
um
0%
So
di
n
Io
si
um
ae
C
uo
rin
0%
e
0%
e
0%
Fl
1.
2.
3.
4.
30
As the relative atomic mass in the
halogens increases
the density decreases.
the boiling point increases.
the first ionisation increases.
the atomic size decreases.
de
at
om
ic
si
ze
at
io
n
cr
...
in
...
r..
.
on
is
ti
th
e
fir
s
e
th
th
e
e
bo
ili
de
ns
ng
ity
po
i
de
nt
in
c
cr
ea
se
s.
0% 0% 0% 0%
th
1.
2.
3.
4.
Which of the following elements would require
the most energy to convert one mole of gaseous
atoms into gaseous ions each carrying two
positive charges?
Scandium
Titanium
Vanadium
Chromium
0%
hr
om
iu
m
m
di
u
na
Va
Ti
ta
n
m
di
u
an
0%
C
0%
iu
m
0%
Sc
1.
2.
3.
4.
30
30
On descending the halogen group of the
Periodic Table, the
1. attracting power for bonding
electrons increases.
2. ionisation energy increases.
3. nuclear charge increases.
4. reactivity increases.
se
s.
re
ac
t
re
a
iv
ity
ha
rg
e
rc
in
c
in
c
re
...
in
...
er
gy
cl
ea
nu
ni
s
io
at
tra
c
tin
g
at
io
n
en
po
w
er
fo
r..
.
0% 0% 0% 0%
Which of the processes represents the
second ionisation energy of magnesium?
1.
2.
3.
4.
Mg+(g)  Mg2+(g) + eMg(g)  Mg2+(g) + 2eMg(s)  Mg2+(g) + 2eMg+(s)  Mg2+(g) + e-
30