ÜSKÜDAR AMERICAN ACADEMY
GRADE 10 IB HL CHEMISTRY WORKSHEET # 2
SUBJECT: PERIODIC TABLE and TRENDS
PERIODIC TABLE
1.
a) Define the term ‘first ionization energy’.
b) Explain why the first ionization energy of magnesium is higher than that of sodium.
2.
Write balanced chemical reactions for the word equations given below. Include the physical states
of both the reactants and the products.
a) Potassium metal is reacted with aqueous bromine solution.
b) Chlorine gas is bubbled through sodium bromide solution.
c) A piece of lithium metal is dropped into water.
3.
Explain why the melting point decreases down group 1 and increases down in group 17.
4.
The effective nuclear charge experienced by an atom’s outer electrons increases across a period
but remains almost the same down a group. Explain this trend.
5. Which is the best definition of electronegativity?
A) Electronegativity is the energy required for a gaseous atom to gain an electron.
B) Electronegativity is the attraction of an atom for a bonding pair of electrons.
C) Electronegativity is the attraction between the nucleus and the valence electrons of an atom.
D) Electronegativity is the ability of an atom to attract electron from another atom.
6. Atoms P, R and S have consecutive atomic numbers. P has two energy levels with four completely
filled and one half-filled orbitals.
a) _________ is a halogen.
b) _________ is a noble gas.
c) _________ has the largest atomic radius.
d) _________ conducts electricity.
e) _________ is in the s-block of the periodic table.
7.
12A, 8B, 9C, 19E
Fill in the blanks with the letters given above representing some elements in the periodic table.
___________ and _________ belong to the p-block of the periodic table.
___________ has an oxidation number of -2 in its most stable state.
___________ is an alkali metal.
___________ can form metal halide with metals.
___________ may form basic solution in water with a remarkable fast reaction.
___________ has the highest nonmetallic character.
___________ is an alkaline earth metal.
1
Periodic Table and Trends
8. Use the letters given in the following periodic table to fill in the blanks.
K
L
M
W
P
Q
R
S
T
a) Atoms of element _______________ have the electron configuration 1s22s22p63s23p3
b) ________________ and ________________ show similar chemical properties.
c) ________________ is a gas that does not form compounds.
d) ________________ has seven energy levels around its nucleus.
e) ________________ exist as diatomic molecules in nature.
f) ________________ has electron configuration ending with ns2np1
g) Element ________________ has the same number of valence electrons as 11Na.
h) Q1+ is isoelectronic with ________________ .
i) Element ________________ has completely filled valence shell.
j) __________________ exists as an anion with an oxidation number of – 3 in its compounds.
k) __________________ is a transition metal.
l) __________________ may form a basic oxide.
9. Consider the following ionization energy data for the elements A, B, C, D.
Element
A
B
C
D
IE1
190
180
175
390
IE2
370
2400
400
720
IE3
1110
2700
2800
1200
IE4
1960
3100
3200
1800
a) If possible, indicate the group number of each element in the periodic table.
b) Which one of these elements have similar chemical properties? Among those that have similar
chemical properties which one has larger atomic radius?
c) If three of these elements are in the same period, which is the correct order of the elements
from left to right in the period?
2
Periodic Table and Trends
10.
Element
X
Y
Z
Atomic
radius
2.35
1.30
1.76
Ionic
radius
3.07
0.89
2.24
Atomic and ionic radii of X, Y and Z elements are
given in the table aside. Decide which atom(s)
form(s) anions which form(s) cations.
11. Compare the atomic volumes of the following pairs..
a) Na and Na1+
b) S and S2-
c) K1+ and P3-
d) Si2+ and Si4-
12. Put the following elements in order of increasing atomic radius.
B, N, Na, Cl
13. Put the following in increasing order of first ionization energies.
a) Ne, Mg2+, S
b) C, N, O
c) Na, Mg, Al
d) Li, Na, F
14. Li, Be, N
a)
Compare the elements given above in terms of their;
i)
ii)
iii)
b)
atomic volume
first ionization energy
second ionization energy
Which one has the highest third ionization energy?
15.
The successive ionization energies of group A
elements X, Y, Z, V and W are given aside.
Element
I1
I2
I3
I4
X
750
1300
6458
9152
Y
378
2964
4158
6760
Z
894
1487
7263
9984
V
434
3008
4762
-
W
512
1274
2682
8756
3
a) How many valence electrons does each atom
have?
b) Identify the group numbers for each of the
elements.
c) Why is the second ionization energy of
element Y is higher, although its first ionization
energy is smaller than X? Explain.
Periodic Table and Trends