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#atomic structure

51 public questions tagged with this topic.

CHEMISTRY

How many electrons are in the L shell of an atom with 10 electrons?

Given: How many electrons are in the L shell of an atom with 10 electrons? These values define the system as per NCERT data. Formula: The L shell (n = 2) has 2s² 2p⁶ = 2 + 6 = 8 electrons.. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: For 10 electrons (neon): 1s² 2s² 2p⁶. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

What is the mass number of an ion with 13 protons, 14 neutrons, and a -1 charge?

Given: What is the mass number of an ion with 13 protons, 14 neutrons, and a -1 charge? Formula: Mass number (A) = protons + neutrons = 13 + 14 = 27. Substitution & Calculation: Charge affects electrons (14), not mass number. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII), Chapter: Electrochemistry (Latest NCERT 2026-27), Topic: Faraday's laws, charge required to reduce Al³⁺, 3F = 3 × 96500 C

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CHEMISTRY

Which orbital designation corresponds to quantum numbers n = 4 and l = 3?

Given: Which orbital designation corresponds to quantum numbers n = 4 and l = 3? These values define the system as per NCERT data. Formula: For n = 4 and l = 3, the subshell is 4f (l = 0: s, l = 1: p, l = 2: d, l = 3: f).. This is standard NCERT relation. Substitution & Calculation: Substituting values and simplifying step by step as per NCERT method. Result: The computed value matches expected outcome and confirms correct choice as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: d and f Block Elements, Topic: Lanthanoid contraction due to poor shielding of 4f orbitals.

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