Periodic Classification

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

A. Flrorine
B. Chlorine
C. Bromine
D. Iodine

A. Metallic character
B. Electronegativity
C. Oxidizing power
D. Tendency to get reduced

A. Group IA
B. Group IB
C. Group VIIA
D. Group VIII

A. O-2
B. H+
C. Cl-
D. Na+

A. Cr
B. Mn
C. Sn
D. O

A. MnO < MnO2 < Mn2O7
B. Mn2O7 > MnO2 > MnO
C. MnO2 > MnO > Mn2O7
D. MnO2 > Mn2O7 > MnO

A. Na+
B. K+
C. Mg+2
D. Ca+2

A. Increase
B. Decrease
C. Remain constant
D. No regular trend

A. Atom will lose electron easily
B. Atom will gain electron easily
C. Atom may form di-positive ion
D. The reason is unknown