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General electronic configuration of lanthanides is
Options
(a) (n – 2) f¹⁻¹⁴ (n – 1) s²p⁶d⁰⁻¹ ns²
(b) (n – 2) f¹⁰⁻¹⁴ (n – 1) d⁰⁻¹ ns²
(c) (n – 2)f⁰⁻¹⁴ (n – 1)d¹⁰ ns²
(d) (n – 2) d⁰⁻¹ (n -I) f ¹⁻¹⁴ ns²
Correct Answer:
(n – 2) f¹⁻¹⁴ (n – 1) s²p⁶d⁰⁻¹ ns²
Explanation:
Lanthanides undergo Aufbau’s principle. The principle states that the electrons should be filled in the ground state first, next the excited state will be filled, so have lanthanide comes under F-block elements, Here 14 electrons can be filled from lowest energy levels to highest energy level. The general electronic configuration is (n-2) f⁽¹⁻¹⁴⁾ (n-1) s²p⁶d⁰⁻¹ n s².
Related Questions: - The number of atoms in 0.1 mol of a triatomic gas is (Na = 6.02 x 10²³ mol⁻¹)
- Which of the following elements will have the lowest first ionisation energy?
- For a reaction, 2NOCl(g) + Cl₂(g) , Kc at 427⁰C is 3 ˣ 10⁻⁶ L.mol⁻¹.
- The standard electrode potential is measured by
- Which of the following inert gases does not have eight electrons
Topics: D and F Block Elements
(91)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The number of atoms in 0.1 mol of a triatomic gas is (Na = 6.02 x 10²³ mol⁻¹)
- Which of the following elements will have the lowest first ionisation energy?
- For a reaction, 2NOCl(g) + Cl₂(g) , Kc at 427⁰C is 3 ˣ 10⁻⁶ L.mol⁻¹.
- The standard electrode potential is measured by
- Which of the following inert gases does not have eight electrons
Topics: D and F Block Elements (91)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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According to Aufbau principal, firstly electrons must be filled in lower energy level. Lanthanides have electronic configuration [Xe] 4f^0-14 5d^0-1 6s^2
Energy order is 6s<4f~5d