Atoms and Atom Model
If no loss or gain of electrons occur by mixing of two atoms, we say that they may be attached to each other due to
proton attraction
neutron attraction
sharing of electrons
opposite charges
sharing of electrons
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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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