Question

Explain the features of the modern periodic table. ​

Answer 1

Main features of long form of periodic table:

• Groups - The vertical columns in the periodic table are known as groups.
• Periods - There are 7 periods in the long form of periodic table.
• Lanthanoids - Group of 14 elements in the sixth period.
• Actinides - Group of 14 elements in the seventh period after actinium.

Explanation:

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