Practice question

MCQ

Question

The number of periods in the modern periodic table is:

Options

Choose one · Correct answer highlighted

6 8 5 7 Correct

Explanation

The modern periodic table has 7 periods, each corresponding to the highest principal quantum number (n=1 to 7). This follows from NCERT principle where relation explains outcome clearly for students.

Share this question

Discussion

Comments

0 comments

Please log in to join the discussion.

No comments yet. Be the first to start the discussion.

Related blogs

Guides and insights connected to this topic

Class IX Science 14 Sep 2026

Journey Inside the Atom Notes - Atomic Structure, Bohr Model and Electronic Configuration

Explore the fundamentals of atoms, from ancient ideas to Dalton's theory, Bohr's model, and electronic configuration in clear notes.

Class X Science 12 Sep 2026

Carbon and its Compounds Notes - Covalent Bond, Allotropes, Functional Groups, Ethanol, Ethanoic Acid and Soaps

Explore carbon’s covalent bonding, allotropes, functional groups, and examples like ethanol, ethanoic acid, and soaps. Includes basic properties and reactions.

Class X Science 12 Sep 2026

Periodic Classification of Elements Notes - Dobereiner Triads, Newlands Octaves, Mendeleev and Modern Periodic Table

Explore early attempts to classify elements, covering Dobereiner’s triads, Newlands’ law of octaves and Mendeleev’s table with examples and key details.