Which of the element whose atomic number is given below cannot accommodate in the present set up of the long form of the periodic table?
  • 107
  • 118
  • 102
  • 126
Which of the following properties generally increases on moving from top to bottom?
  • Ionization energy
  • Valency
  • Atomic size
  • Non-metallic character
What is the basis of long form of the periodic table?
  • Atomic size
  • Metallic and Non-metallic character
  • Atomic number
  • Atomic mass
The law of modern periodic table was proposed by:-
  • Dobereincer
  • D.I Mendeleev
  • Newlands
  • H.G.I moselly
Which of the following statement is not correct about the trends when going from left to right across the periodic table?
  • The elements become less metallic in nature
  • The number of valence electrons increases
  • The atoms lose their electrons more easily
  • the oxides become more acidic
The least metallic element of group  I is:-
  • Sodium
  • Potassium
  • Caesium
  • Lithium
The number of periods in the long form of the periodic table is:-
  • 10
  • 7
  • 18
  • 6
According to IUPAC recommendations, the number of groups in the long form of the periodic table is:-
  • 7
  • 16
  • 8
  • 18
Which of the following pairs of elements does not belong to same  group?
  • \(N.\,\,P\)
  • \(Al.\,\,Si\)
  • \(Cl.\,\,Br\)
  • \(Mg.\,\,Ca\)
The law of octaves was proposed by:-
  • Dobereiner
  • Newlands
  • Lother Meyer
  • Mendeleev
Which of the following has largest atomic size?
  • \(O\)
  • \(F\)
  • \(Be\)
  • \(C\)
Which is not true about the noble gases?
  • Xenon is the most reactive among these
  • They are non metallic in nature
  • They are radioactive in nature
  • They exist in atomic form
Which of the following belongs to group 18?
  • \(Rb\)
  • \(Ar\)
  • \(Sr\)
  • \(I\)
Which of the following has the lowest number of electrons in the valency shell?
  • \(B\)
  • \(C\)
  • \(O\)
  • \(N\)
Which one is more metallic element?
  • \(Na\)
  • \(Mg\)
  • \(Al\)
  • \(Si\)
Which of the following sets of elements do not belong to the same group?
  • \(C,\,\,Si, \,\,Ge\)
  • \(F,\,\,CI,\,\,Br\)
  • \(Na, \,\,K,\,\, Rb\)
  • \(P, \,\, S,\,\, CI\)
Which of the following has the maximum non-metallic character?
  • \(Br\)
  • \(Cl\)
  • \(I\)
  • \(F\)
The valence shell of element A contains 3 electrons while the valence shell of element B contains 6 electrons. If A combines with B, the probable chemical formula of the compound is
  • A
  • AB
  • B
  • None of the above
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