Periodic Classification of Elements

21.Vertical columns in the periodic table are called
 
A. cycle
 
B. square
 
C. electrochemical sequence
 
D. nonmetal
 
Option”B” is correct
22.The horizontal columns in the periodic table are called
 
A. cycle
 
B. square
 
C. electrochemical sequence
 
D. nonmetal
 
Option”A” is correct
23.What is the total number of groups in the modern periodic table?
 
A. 7
 
B. 9
 
C. 16
 
D. 18
 
Option”D” is correct
24.What is the total number of periods in the modern periodic table?
 
A. 5
 
B. 7
 
C. 9
 
D. 16
 
Option”B” is correct
25.The elements are arranged in the modern periodic table
 
A. in decreasing atomic mass
 
B. increasing atomic mass
 
C. increasing atomic volume
 
D. increasing atomic number
 
Option”D” is correct
26.The originator of the modern periodic law is
 
A. mosley
 
B. mendeleev
 
C. Avogadro (Avogadro)
 
D. Dalton
 
Option”A” is correct
27.who is the father of periodic table of elements
 
A. johannes vanderwals
 
B. johan baer
 
C. Alfred Nobel
 
D. Dmitri Mendeleev
 
Option”D” is correct
28.The long form of the periodic table depends on
 
A. on the size of the atom
 
B. on the mass of the atom
 
C. on atomic number
 
D. on electronegativity
 
Option”C” is correct
29.Which of the following is the modern periodic table based on
 
A. atomic volume
 
B. atomic number
 
C. atomic mass
 
D. atomic size
 
Option”B” is correct
30.Who propounded the law that the physical and chemical properties of elements are periodic functions of their atomic number?
 
A. mendeleev
 
B. mosley
 
C. Newlands
 
D. rutherford
 
Option”B” is correct