Which of the following elements are not ...

Which of the following elements are not available at the time of Mendeleeff?

A

Scandium

B

Gallium

C

Germanium

D

Above all

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE

Ea2O3: EsO2 : GeO2 [ Ea = Eka aluminium, Es= Eka silicon]
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Mendeleeff said about eka-aluminium "If I hold it in my hand, it will ...
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Which of the following elements are not available at the time of Mende...
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Which of the following element does not contain '3s' orbital ?
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Why are lanthanides and actinides placed separately at the bot...
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If 'He' is not a inert gas, it should be placed in the group.
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n = 1: 1s ::n = 2: ………….
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Guess the period if it has only '8' elements and K, L shells.
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Which one shrinks in size than atom : i) Na^+ii) Na iii) Cl^- iv) CI
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The ionization potential of 'Be' is more than 'B'. This is due to
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Assertion (A) : The size of Na^+ ion is less than 'Na' atom. Reason (R...
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The element at the bottom of a group would be expected to show ...
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The outermost main shell of an element is 'M' shell. This element belo...
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Give example where the electronic configuration of an element does not...
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generally show less electronegative character.
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The atomic radius of Cl than Cl^- atom.
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cannot be decomposed into further substance by a physical or chemical ...
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Which one shrinks in size than atom : i) Na^+ii) Na iii) Cl^- iv) CI
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Atomic number of the element which has diffe rentiating electron enter...
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Which of the following is the correct order of electron affinity
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