Question

mention the main features of the modern period ie table​

Answer 1

Answer:

the main features of the modern period ie table is :

• Elements are arranged in the increasing order of atomic numbers.
• Elements in the modern periodic table are arranged in 7 periods and 18 groups.
• Horizontal rows are called periods and vertical columns are called groups.
• Elements are placed in periods based on the number of shells in their atoms.
• The shortest period is the first period which contains only two elements – Hydrogen and Helium.
• The second period contains elements from Lithium to Neon.
• The third period contains elements from Sodium to Argon.

Explanation:

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