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Atomic Structure
Number of H – bond form by unpaired electrons of liquid NH3 ,H2O and HF respectively are
3, 4, 2
4, 4, 2
3, 2, 1
1, 2, 1
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Atomic Structure
During the formation of chemical bond, the potential energy of the system
decreases
increases
does not change
none of these
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Atomic Structure
If two covalently bonded atoms are identical, the bond is identified as
nonpolar covalent.
Polar covalent.
Ionic.
Dipolar.
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Atomic Structure
What is the name of the bond that occurs between two atoms that have the same or similar electronegativities?
ionic
covalent
metallic
coordinate
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Atomic Structure
How is an electron’s principal quantum number symbolized?
s
p
n
d
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Atomic Structure
Most of the volume of an atom is occupied by the
nucleus.
nuclides.
electron cloud.
protons.
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Atomic Structure
The atomic mass listed in the periodic table is the
average atomic mass.
relative atomic mass of the most abundant isotope.
relative atomic mass of the most stable radioactive isotope.
mass number of the most abundant isotope.
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Atomic Structure
All isotopes of hydrogen contain
one neutron.
two electrons.
one proton.
two nuclei.
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Atomic Structure
When covalent bonds are formed between atoms having different electronegativities, the electrons tend to spend more time at the atom with the greater electronegativity. Such chemical bonds are called
Electrovalent bonds
Polar covalent bonds
Coordinate covalent bonds
None of the above
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Atomic Structure
The one outermost electron present in Na element at
one corner of simple cube
eight corner of simple cube
center of simple cube
each corner of simple cube
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