Question

Which of the following statements about the Modern Periodic Table is correct?

• A. It has 18 horizontal rows known as periods .
• B. It has 7 vertical columns known as periods .
• C. It has 18 vertical columns known as groups .
• D. It has 7 horizontal rules known as groups.

Answer 1

The correct option is C

It has 18 vertical columns known as groups .

1. In Modern Periodic Table when elements are arranged in the increasing order of atomic number, those having an equal number of valence electrons occur at regular intervals.
2. The table is divided into 7 horizontal rows called periods, which is a depiction that how many shells are present in an atom present in that period.
3. Groups are the vertical columns of elements in the Periodic table.
4. There are 18 vertical columns in the modern periodic table, with groups (I to VIII and zero) split into subgroups, for a total of 18 groups numbered 1,2,3,4....18 from left to right across the table.
5. Groups have the same valency and same valance shell electronic configuration. They dwell similar chemical properties as they have the same number of electrons present in the outermost shell.

Option (C) would be the correct option and option (A), (B) and (D) are incorrect.