How many periods are there in the periodic table?
a) 7
b) 8
c) 10
d) 18
Which of the following property/ies of an atom is shown by the period number?
a) valence electron
b) valence shell number
c) number of shells
d) all of these
Elements in the
first shell have…… electronic shell/s.
a) 1
b) 2
c) 7
d) 8
How many shells are present in the element of the second period?
a) 1
b) 2
c) 3
d) 4
How many shells are present in the element of the third period of the periodic table?
a) 1
b) 2
c) 3
d) 4
How many shells are present in the element of the fourth period?
a) 1
b) 2
c) 3
d) 4
