Question

Write 5 points about long form of periodic table.


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Answer 1

Following points may help you:-

1. In this, elements are arranged in increasing order of their atomic number.

2. There are seven horizontal rows called periods.

3. 18 vertical columns called groups.

4. All elements present in a group have same general electronic configuration or have same outer electronic configuration means they have same Properties.

5. Elements of a Group have same valence electron and valency.

6. Period 1st, 2nd and 3rd are called short period whereas rest are called long period.

Answer 2

Explanation:

Elements in Modern periodic table are arranged in 7 periods and 18 groups. --- Elements are placed in a period based on the number of shells in their atom. - The shortest period is the first period which contains only two elements – Hydrogen and Helium. The second period contains elements from Lithium to Neon.