01.For each of the following
items, choose the most correct answer from the given alternatives and write its
letter beside the item number in your answer sheet.
i)
The law of octaves by Newlands was unfortunate
because:
A. It had only eight
column
B. It had eight
periods
C. He grouped
together certain elements which had different characteristics
D. Other scientists
did not like him hence rejected
ii)
The periodic recurrence of similar properties when
elements are arranged according to their atomic numbers is called:
A. Periodic
classification
B. Modern periodic
law
C. Periodicity
D. Mendeleev’s periodic
law
iii) The metallic
elements in group II are called:
A. Alkali metals
B. Alkali earth
metals
C. Noble gases
D. Salt formers
iv)
The noble gases do not react because:
A. They form
alkaline solution with water
B. They form salts
with group I elements
C. They are found in
the earth’s crust
D. They are stable
since they have full filled outer most shell.
v)
The elements in the periodic table which tend to
display both metallic and non-metallic characteristics are called:
A. Halogens
B. Group I elements
C. Alkali earth
metals
D. Metalloids
Answers:
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i |
ii |
iii |
iv |
v |
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02.Define the following terms
i.
Melting point
ii.
Boiling point
iii.
Density
iv.
Electro negativity
v.
Ionization energy
vi.
Atomic radius
03.(a) Give the reason to why,
i.
Group I elements are called Alkali metals
ii.
Sodium (Na) is stored under kerosene
(b) Mention any four (4)
physical properties of three metals (Lithium, Sodium and potassium) as the
members of group I elements.
04.With a balanced chemical
equation state what happen when:
i.
Group I metals react with oxygen?
ii.
Alkali metals react with water
05.Study the part of the modern
periodic table below and answer the questions that follow
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I |
II |
III |
IV |
V |
VI |
VII |
VIII |
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1 |
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2 |
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W |
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I |
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C |
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K |
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3 |
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L |
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N |
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F |
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4 |
B |
E |
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QUESTIONS:
i)
What is the name and chemical symbol of the element
in group II, period 2?
ii)
Write electronic configurations of the elements
represented by the letters W, I, C, K, L, F
iii) Write element B
in nuclide notation and hence write its number of proton, electron and neutron.
iv)
Using the letters in the table, which elements are:
a) Alkali metals
b) Alkali earth
metals
c) Metalloids
d) Noble (inert)
gases
e) Halogens
