Question

The incomplete period of the periodic table is _____________ .choose the correct answer from the bracket.( Na,(sodium),atomic mass,18th,(8viiiₐ),7th period,metaalic)

Answer 1

7 th period is the answer

Answer 2

Dear Student,

◆ Answer -

The incomplete period of the periodic table is 7th period.

● Explanation -

• Previously 7th period of the period of the table was thought to be incomplete because some of elements in that period were not discovered.
• But now blank spaces in 7th period are filled after discovery of those elements in laboratory. Hence, now it's supposed to be completed.

Thanks dear...