The atomic radii decreases by increasing atomic number in________________?
(A) Alkali metal
(B) Alkaline earth metal
(C) Elements from Li to Ne
(D) Halogens
Many properties of an element and its compounds can be predicted from the position of the element in the periodic table. What property could not be predicted in this way ?
(A) The nature of its oxides
(B) The charge on its ions
(C) The formula of its oxide
(D) Its number of isotopes
The longest period in the modern periodic table is___________________?
(A) 6th
(B) 7th
(C) 2nd and 3rd both
(D) 5th
Noble gases are named so because they are__________________?
(A) less reactive
(B) Zero group elements
(C) Having completely filled valence shell
(D) All
Which element was not known when Mendeleev proposed his classification ?
(A) Hydrogen
(B) Sodium
(C) Copper
(D) Germanium
The scientist who did not contribute in the construction of periodic table ?
(A) Al-Razi
(B) Moseley
(C) Dobereiner
(D) Democritus
Among halogens the highest boiling point is of___________________?
(A) Flrorine
(B) Chlorine
(C) Bromine
(D) Iodine
Which of the following always increases on going from top to bottom in a group ?
(A) Metallic character
(B) Electronegativity
(C) Oxidizing power
(D) Tendency to get reduced
An element having low value of ionization energy and low value of electron affinity is likely to belong to__________________?
(A) Group IA
(B) Group IB
(C) Group VIIA
(D) Group VIII