Question

The long form of periodic table consists of -

• A. seven periods & eight groups
• B. seven periods & eighteen groups
• C. eight periods & eighteen groups
• D. eighteen periods & eight groups

Answer 1

The correct option is B

seven periods & eighteen groups

Explanation:

• The periodic table designed on the basis of the modern periodic law is called the modern periodic table, it is also termed as long form of the periodic table.
• The modern periodic table arranges the elements into horizontal rows called periods and vertical columns called groups such that elements of the same group have same outer electronic configuration and thus, similar properties. The elements of the same period have same number of energy levels or shells.
• The long form of periodic table contains seven periods and eighteen groups.

Final Answer:

Therefore, the correct option is (B) seven periods and eighteen groups.