A. Location of nucleus by Rutherford
B. Atomic number by Moseley
C. X-rays by Roentgen
D. Natural radioactivity by Henry Bacquerel.
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Which one of the following is not a periodic property ?
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In which of the following pairs are elements belonging to the same group ?
A. Melting point of elements
B. Boiling point of elements
C. Ionization energy of elements
D. Coordination number of ions
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Hydrogen resembles with carbon because of having________________?
A. Boron & Beryllium
B. Nitrogen & Phosphorous
C. Magnesium & Aluminium
D. Gallium & Helium
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Amphoteric exides are those which possess ____________ properties?
A. Same number of electrons in the valence shell
B. Similar physical state
C. Remarkable reducing properties
D. Homovalent (show same valency)
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Modern periodic table has been divided in ___________ blocks?
A. Acidic
B. Basic
C. Acidic and basic
D. Neutral and acidic
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Seventh period contains _________________ normal elements ?
A. 2
B. 4
C. 8
D. 7
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The longest period in the modern periodic table is___________________?
A. 2
B. 4
C. 6
D. 8
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Noble gases are named so because they are__________________?
A. 6th
B. 7th
C. 2nd and 3rd both
D. 5th
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Which element was not known when Mendeleev proposed his classification ?
A. less reactive
B. Zero group elements
C. Having completely filled valence shell
D. All
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