Which of the following element/s is/are present in first period?
a) hydrogen
b) helium
c) lithium
d) both a and b
How many orbit/s of electron/s is/are present in the element of first period?
a) 1
b) 2
c) 3
d) 4
How many orbit/s of electron/s is/are present in the element of second period?
a) 1
b) 2
c) 3
d) 4
How many orbit/s of electron/s is/are present in the element of third period?
a) 1
b) 2
c) 3
d) 4
How many orbit/s of electron/s is/are present in the element of fourth period?
a) 1
b) 2
c) 3
d) 4
How many orbit/s of electron/s is/are present in the element of fifth period?
a) 1
b) 2
c) 3
d) 5
Wrong answers . In period of periodic table 2 elements are present
by at 2025-03-28 04:54:01