How many shells are present in the element of the seventh period?
a) 1
b) 2
c) 3
d) none of these
How many elements are present in the first period of the periodic table?
a) 2
b) 8
c) 18
d) 32
How many elements are present in the second period of the periodic table?
a) 2
b) 8
c) 18
d) 32
How many elements are present in the third period of the periodic table?
a) 2
b) 8
c) 18
d) 32
How many elements are present in the fourth period of the periodic table?
a) 2
b) 8
c) 18
d) 32
How many elements are present in the fifth period of the periodic table?
a) 2
b) 8
c) 18
d) 32
