Which discovery caused a revision in the periodic law as stated by Mendeleev ?

A. Location of nucleus by rutherford
B. Atomic number by moseley
C. X-rays by roentgen
D. Natural radioactivity by henry bacquerel.

The property which increases upto group IV-A then decreases on wards_______________?

A. Ionization energy
B. Atomic radii
C. Melting & boiling points
D. Atomic volume

Deuterium reacts with oxygen to form________________?

A. Hard water
B. Heavy water
C. Soft water
D. Water gas

Ionization energy depends upon____________________?

A. Nuclear charge
B. Atomic size
C. Shielding effect
D. I.e depends upon all of the above and nature of orbital

Addition of 2nd electron to a uni negative ion is always____________________?

A. Exothermic
B. Endothermic
C. Data is insufficient
D. Unpredictable

Metallic characters of alkali metals_____________________?

A. Increase down the group
B. Decrease down the group
C. No regular trend
D. Remain same

Oxidation state of an atom represents____________________?

A. Number of electrons gained
B. Number of electrons lost
C. Apparent charge in compound
D. Its vacancies

The scientist who did not contribute in the construction of periodic table ?

A. Al-razi
B. Moseley
C. Dobereiner
D. Democritus

Which element was not known when Mendeleev proposed his classification ?

A. Hydrogen
B. Sodium
C. Copper
D. Germanium

Noble gases are named so because they are__________________?

A. Less reactive
B. Zero group elements
C. Having completely filled valence shell
D. All