Question

5. An element X is placed in the 4th period and in the group 13 in the periodic table. The atomic number
of the element X is:
(a) 28
(b) 29
(c) 23
(d) 31​

Answer 1

Answer:

galium is placed in the 4th period and in the group 13.

the atomic no of galium is 31

Answer 2

Answer:

28 option a

or it will be 31 option d