Magnesium, aluminum and sodium are present in……..period.
a) 1st
b) 2nd
c) 3rd
d) 4th
How many electronic shells are present in magnesium, sodium and aluminum?
a) 1
b) 2
c) 3
d) 4
Which of the following rows are called group of periodic table?
a) horizontal rows
b) oblique rows
c) vertical columns
d) all of these
How many groups are there in modern periodic table?
a) 7
b) 8
c) 18
d) 32
How many main or representative groups are present in modern periodic table?
a) 7
b) 8
c) 18
d) 32
Group A elements are known as…….
a) transition elements
b) main elements
c) lanthanides
d) actinides
