Question

4) Discuss construction of long periodic table?
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Answer 1

Question

Discuss Construction of Long Periodic Table

Answer

The arrangement of elements in Modern {Long form} periodic table is based on their electronic configurations.

The horizontal rows of elements in a periodic table is called Periods

ㅤㅤㅤThe elements in periods have consecutive atomic numbers.

The number of elements in each period is given as-:

• 1st period contains 2 elements. It is called very short period
• 2nd period contains 8 elements. It is called short period
• 3rd period contains 8 elements. It is called Short period
• 4th period contains 18 elements. It is called long period.
• 5th period contains 18 elements. It is called long period
• 6th period contains 32 elements. It is called very long period.
• 7th period contains rest of the elements. It is Incomplete.

The Vertical columns in a periodic table are called Groups

There are 18 Groups in long form of periodic table.