Which of the following elements is not found in CaHCO ?
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Calcium
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Carbon
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Cobalt
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Oxygen
Q.3.
What particles are present in the nucleus of an atom?
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Protons only
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Neutrons only
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Electrons only
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Protons and neutrons
Q.4.
Where are the electrons found?
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In a single group close to the nucleus
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Orbiting the nucleus like the planets of the Solar System
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In 'shells' surrounding the nucleus
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Fixed in place at different distances from the nucleus
Q.5.
Which of the following give the charges in order for the proton, neutron and electron?
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+1, 0, -1
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0, +1, -1
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-1, +1, +1
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+1, +1, -1
Q.6.
Which of the following statements is true in an atom?
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The number of protons is always equal to the number of electrons
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The number of protons is always equal to the number of neutrons
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The number of protons is sometimes equal to the number of electrons
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The number of protons is never equal to the number of electrons
Q.7.
Atoms of a particular element all have the same number of what?
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Particles
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Nuclei
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Neutrons
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Protons
Q.8.
The element Argon has an atomic number of 18 and a mass number ofWhich of the following statements is .
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Argon has 18 protons and 22 neutrons
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Argon has 18 neutrons and therefore 18 electrons
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Argon has 18 electrons and 22 protons
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Argon has 18 neutrons and 22 protons
Q.9.
Which of the following represents the arrangement of the 18 electrons in the Argon atom?
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2.8.6.2
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2.8.2.6
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8.10
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2.8.8
Q.10.
The element sodium has an atomic number 11 and mass numberWhich of the following gives the correct number of protons, neutrons and the electron arrangement in the correct order?
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23, 11, (2.8.1)
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12, 11, (2.6.3)
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11, 12, (2.8.1)
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11,12, (8.2.1)
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