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 pure chemical substance which cannot split into
two or more simpler substances by any chemical means is:-
A. An element
B. An atom
C. A compound
D. A mixture
ii)
In 1803 an Englishman called ________ developed the
theory about the atom.
A. John Dalton
B. Neil’s Bohr
C. Mendeleev
D. John Newlands
iii) The following are
the properties of proton, except:
A. It is a
positively charged particle
B. Its charge is +1
C. It is found in
the nucleus of an atom
D. Its symbol is N+1
iv)
The arrangement of electrons in different shells is
referred to as:
A. Energy level
B. The periodic
trend
C. Electronic
configuration
D. Stability of an
atom
v)
The isotopes of hydrogen are:
A. Hydrogen,
bi-hydrogen, and Helium
B. Hydrogen,
Deuterium and tritium
C. Carbon-12,
carbon-13 and carbon-14
D. Hydrogen,
Nitrogen and Oxygen
Answers:
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i |
ii |
iii |
iv |
v |
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02.Define the following terms
i.
Matter
ii.
An atom
iii. Electronic
configuration
iv.
Atomic number
v.
Relative atomic mass (RAM)
03.(a)State the four (4) Modern
concepts of Dalton’s Atomic Theory
(b)Mention the
three sub-atomic particles with their respective properties.
04.(a) Define Isotopes
(b) Calculate the relative
atomic mass (RAM) of chlorine given the two isotopes of chlorine as 3517Cl (75%) and 3717Cl (25%).
05.(a) Atom Q has a mass number
of 49 and an atomic number of 24.
i.
What is its neutron number?
ii.
What is the number of electrons in the atom Q?
(b)Write the electronic configuration of the element 15M, then state the group and period in which element M belongs.
