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Q 1.
Electrons have?
Ans.
Negative charged.
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Q 2.
Rutherford alpha-particle scattering experiment led to discovery of?
Ans.
Atomic Nucleus.
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Q 3.
The mass of an electron is about how many times the mass of an hydrogen atom?
Ans.
1/ 2000.
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Q 4.
Who discovered Neutron?
Ans.
J Chadwick.
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Q 5.
Who discovered atomic nucleus?
Ans.
Rutherford.
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Q 6.
Atomic number of an element is 9 and number of electrons are 10. Find the mass number and name of the Atomic species?
Ans.
Fluorine 19.
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Q 7.
Combining capacity of an atom is called?
Ans.
Valancy.
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Q 8.
Shells of an atom are designed as?
Ans.
K, L, M, N.
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Q 9.
Name the isotopes is used fir treatment for cancer?
Ans.
Cobalt.
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Q 10.
Name the isotopes is used as fuel in nuclear reactors?
Ans.
Uranium.
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Q 11.
If Z= 3, name the element?
Ans.
Lithium.
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Q 12.
Which charge have neutrons?
Ans.
No charge.
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Q 13.
Elements are defined by the number of?
Ans.
Protons.
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Q 14.
Atoms having same mass number but different atomic number are called?
Ans.
Isobars.
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Q 15.
Find the number of protons if mass number of Sulphur is 32 and atomic number is 16.
Ans.
16.
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Q 16.
How many atom are there in the gold foil used in the Rutherford model of an atom?
Ans.
1000.
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Q 17.
Which isotope is used in the treatment of goiter?
Ans.
Iodine 131.
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Q 18.
How many electrons have carbon in its outermost shell?
Ans.
4.
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Q 19.
Who discovered Neutron?
Ans.
Chadwick.
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Q 20.
Name the scientist who discovered electron and proton?
Ans.
J.J Thomson and E. Goldstein.
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