Question:
Almost the entire mass of an atom is concentrated in the__________.
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1.
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proton
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2.
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electrons
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3.
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nucleus
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4.
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neutrons
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Question:
Electron was discovered by___________.
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1.
|
Chadwick
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2.
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Thomson
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3.
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Goldstein
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4.
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Bohr
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Question:
An atom has a mass number of 23 and atomic number 11. The number of protons are_________.
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1.
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11
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2.
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12
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3.
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23
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4.
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44
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Question:
The mass of the atom is determined by________.
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1.
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neutrons
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2.
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neutron and proton
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3.
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electron
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4.
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electron and neutron
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Question:
The K, L and M shells of an atom are full. Its atomic number is_______.
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1.
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18
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2.
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20
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3.
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10
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4.
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12
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Question:
Which of the air pressures is appropriate for the production of cathode rays in
the discharge tube?
|
1.
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1 cm Hg
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2.
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1 mm Hg
|
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3.
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0.001 cm Hg
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4.
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0.001 mm Hg
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Question:
Cathode rays are deflected towards__________.
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1.
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positive electrode
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2.
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negative electrode
|
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3.
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both electrodes
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4.
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none of the electrodes
|
Question:
The absolute charge of an electron is___________.
|
1.
|
- 1.6 x 10-19C
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2.
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+ 1.6 x 10-19C
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3.
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1.6 x 10-19C
|
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4.
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16 x 10-19C
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Question: The proton is heavier than an electron by___________.
|
1.
|
1850 times
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|
2.
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1840 times
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3.
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1000 times
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4.
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100 times
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Question:
Carbon-12 atom has_______________.
|
1.
|
6 electrons, 6 protons, 6 neutrons
|
|
2.
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6 electrons, 12 protons, 6
neutrons
|
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3.
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12 electrons, 6 protons, 6
neutrons
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4.
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18 electrons, 6 protons and 6
neutrons
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Question:
Chadwick got the Nobel Prize for the discovery of __________.
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1.
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protons
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2.
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neutrons
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3.
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electrons
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4.
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mesons
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Question:
Mass number is equal to the_________.
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1.
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number of protons + number of
electrons
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2.
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number of protons + number of
neutrons
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3.
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number of neutrons + number of
electrons
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4.
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number of electrons
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Question:
The element X has 2 valence electrons. It is a____________.
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1.
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metal
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2.
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non-metal
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3.
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metalloid
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4.
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gas
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Question:
The volume of the nucleus of an atom when compared to the extra nuclear part
is_________.
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1.
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bigger
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2.
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smaller
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3.
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same size
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4.
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unpredictable
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Question:
In Rutherford's alpha-scattering experiment, a foil of element that was used
_______________.
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1.
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gold
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2.
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silver
|
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3.
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aluminum
|
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4.
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magnesium
|
Question:
An element has an electronic configuration of 2, 8, 7. Its valency is
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1.
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1
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2.
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7
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3.
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17
|
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4.
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8
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Question:
The other name of 
is _________
is _________|
1.
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protium
|
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2.
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tritium
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3.
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deuterium
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4.
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proton
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Question:
During a chemical reaction, atomic number_________.
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1.
|
changes
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2.
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remains same
|
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3.
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changes and then is restored
|
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4.
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changes alternately
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Question:
The fixed circular paths around the nucleus are called_________.
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1.
|
orbits
|
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2.
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orbitals
|
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3.
|
nucleons
|
|
4.
|
mesons
|
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