Question

The tenth elements in the periodic table resembles with the

• A. First period
• B. Second period
• C. Fourth group
• D. Ninth group

Answer 1

Answer: (B)

Second period

Answer 2

Each period consists of a series of elements whose atom have the same principal quantum no. $(n)$ of the outer most shell i.e. In second period $n = 2$, this shell has four orbitals (one 2s and three $2p$) which can have eight electrons, hence second period contains 8 elements from atomic no. 3 to 10.