Atoms and Atom Model
One molecule of carbon dioxide consists of
one carbon and two oxygen atoms
one carbon and oxygen atom
two carbon and one oxygen atom
two carbon and one oxygen atoms
one carbon and two oxygen atoms
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The smallest atom in ‘periodic table’ yet found isA. hydrogen
B. helium
C. lithium
D. magnesium
The symbol of “Boron” is
A. Bo
B. C
C. N
D. Br
When shell L is completed, next electron moves to
A. shell M
B. shell S
C. shell P
D. shell F
The ionic chemical formula of ‘chlorine’ is
A. Cl–
B. Cl+
C. Cl–
D. Cl+
The symbol of Nitrogen is
A. Bo
B. C
C. N
D. Br
The number of protons and electrons in an atom of uranium is
A. 90
B. 91
C. 92
D. 94
To study the changes that occur during photosynthesis,
A. carbon-12 is added to carbon dioxide
B. carbon-13 is added to carbon dioxide
C. carbon-14 is added to carbon dioxide
D. carbon-14 is added to carbon monoxide
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