Element - 21 : Scandium (Sc) â Used in bicycles, alloys.
Basic Information / āĻŽā§āϞāĻŋāĻ āϤāĻĨā§āϝ : i. Atomic Number: 21, ii. Symbol: Sc, iii. Nature: Metal (Transition Metal)
Scandium is a lightweight and strong metal. : Scandium āĻāĻāĻž āĻĒāĻžāϤāϞ āĻā§°ā§ āĻŽāĻāĻŦā§āϤ āϧāĻžāϤā§āĨ¤
Atomic Structure / āĻĒā§°āĻŽāĻžāĻŖā§ āĻāĻ āύ : i. Protons: 21, ii. Electrons: 21
It has equal number of protons and electrons. : āĻā§āĻžāϤ ⧍⧧āĻāĻž proton āĻ⧰⧠⧍⧧āĻāĻž electron āĻĨāĻžāĻā§āĨ¤
Properties / āĻā§āĻŖāϧ⧰ā§āĻŽ
- Transition metal
Light and strong : āĻĒāĻžāϤāϞ āĻā§°ā§ āĻŽāĻāĻŦā§āϤ
- Rare element : āĻĻā§āώā§āĻĒā§ā§°āĻžāĻĒā§āϝ āĻŽā§āϞ
- Forms strong alloys : āĻŽāĻāĻŦā§āϤ alloy āĻāĻ āύ āĻā§°ā§
Uses / āĻŦā§āĻ¯ā§ąāĻšāĻžā§°
- Used in aircraft industry : āĻŦāĻŋāĻŽāĻžāύ āĻāĻĻā§āϝā§āĻāϤ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻšā§
- Used in sports equipment : Sports equipmentāϤ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻšā§
- Used in metal alloys for strength : Alloy āϤā§ā§āĻžā§° āĻā§°āĻžāϤ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻšā§
Why is Scandium Important ? / āĻāĻŋā§ āĻā§ā§°ā§āϤā§āĻŦāĻĒā§āϰā§āĻŖ ?
Scandium is important because it makes strong, lightweight alloys used in high-performance applications.
Scandium āĻā§ā§°ā§āϤā§āĻŦāĻĒā§āϰā§āĻŖ āĻāĻžā§°āĻŖ āĻ āĻĒāĻžāϤāϞ āĻā§°ā§ āĻŽāĻāĻŦā§āϤ alloy āϤā§ā§āĻžā§° āĻā§°ā§, āϝāĻŋ āĻāύā§āύāϤ āĻāĻžā§°ā§āϝā§āϝāĻā§āώāĻŽ āĻā§āώā§āϤā§ā§°āϤ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻšā§āĨ¤
Fun Fact / ā§°āϏāĻžāϞ āϤāĻĨā§āϝ :
Scandium is often used in high-performance sports gear like bats and bicycles. : Scandium āĻĒā§ā§°āĻžā§ā§āĻ sports gear (bat, cycle)āϤ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻšā§āĨ¤
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Scandium – MCQs
Q1. What is the atomic number of Scandium ? : Scandium-ā§° atomic number āĻāĻŋāĻŽāĻžāύ ?
(a) 20 (b) 21 (c) 22 (d) 23
Ans / āĻāϤā§āϤ⧰: (b) 21
Explanation: Atomic number = number of protons → Sc has 21. āĻŦā§āϝāĻžāĻā§āϝāĻž: Atomic number āĻŽāĻžāύ⧠proton āϏāĻāĻā§āϝāĻž → Sc-āϤ ⧍⧧āĻāĻž āĻāĻā§āĨ¤
Q2. Scandium belongs to which block ? : Scandium āĻā§āύ block-āϤ āĻĒā§°ā§ ?
(a) s-block (b) p-block (c) d-block (d) f-block
Ans / āĻāϤā§āϤ⧰: (c) d-block
Explanation: It is a transition metal (d-block). āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻ āĻāĻāĻž transition metal (d-block)āĨ¤
Q3. Scandium is placed in which group ? : Scandium āĻā§āύ group-āϤ āĻāĻā§ ?
(a) 1 (b) 2 (c) 3 (d) 4
Ans / āĻāϤā§āϤ⧰: (c) 3
Explanation: Sc is the first element of Group 3. āĻŦā§āϝāĻžāĻā§āϝāĻž: Sc Group 3-ā§° āĻĒā§ā§°āĻĨāĻŽ āĻŽā§āϞāĨ¤
Q4. Electronic configuration of Scandium is ? : Scandium-ā§° electron configuration āĻāĻŋ ?
(a) [Ar]3d¹4s² (b) [Ar]3d²4s¹ (c) [Ar]3dâ°4s² (d) [Ar]3d³4s²
Ans / āĻāϤā§āϤ⧰: (a)
Explanation: Total electrons = 21 → correct configuration. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻŽā§āĻ electron ⧍⧧ → āĻāĻ configuration āϏāĻ āĻŋāĻāĨ¤
Q5. Scandium forms which ion ? : Scandium āĻā§āύ ion āĻāĻ āύ āĻā§°ā§ ?
(a) Scâē (b) Sc²âē (c) Sc³âē (d) Scâ´âē
Ans / āĻāϤā§āϤ⧰: (c) Sc³âē
Explanation: It commonly loses 3 electrons. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻ āϏāĻžāϧāĻžā§°āĻŖāĻ¤ā§ ā§ŠāĻāĻž electron āĻšā§ā§°ā§ā§ąāĻžā§āĨ¤
Q6. Scandium is mainly used in which field ? : Scandium āĻŽā§āĻā§āϝāϤ āĻ’āϤ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻšā§ ?
(a) Agriculture (b) Aircraft (c) Food (d) Medicine
Ans / āĻāϤā§āϤ⧰: (b) Aircraft
Explanation: Used in aerospace alloys. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻŦāĻŋāĻŽāĻžāύ (aerospace) alloy-āϤ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻšā§āĨ¤
Q7. Scandium is known for which property ? Scandium āĻāĻŋāĻšā§° āĻŦāĻžāĻŦā§ āĻāύāĻžāĻāĻžāϤ ?
(a) Heavy (b) Light & strong (c) Liquid (d) Gas
Ans / āĻāϤā§āϤ⧰: (b) Light & strong
Explanation: It forms strong but lightweight alloys. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻ āĻĒāĻžāϤāϞ āĻāĻŋāύā§āϤ⧠āĻŽāĻāĻŦā§āϤ alloy āϤā§ā§āĻžā§° āĻā§°ā§āĨ¤
Q8. Scandium is discovered by ? Scandium āĻāĻžāĻā§° āĻĻā§āĻŦāĻžā§°āĻž āĻāĻŦāĻŋāώā§āĻā§āϤ āĻšā§āĻāĻŋāϞ ?
(a) Dalton (b) Nilson (c) Newton (d) Bohr
Ans / āĻāϤā§āϤ⧰: (b) Nilson
Explanation: Discovered in 1879 by Lars Nilson. āĻŦā§āϝāĻžāĻā§āϝāĻž: ā§§ā§Žā§ā§¯ āĻāύāϤ Lars Nilson-āĻ āĻā§ąāĻŋāώā§āĻāĻžā§° āĻā§°āĻŋāĻāĻŋāϞāĨ¤
Q9. Scandium belongs to which period ? : Scandium āĻā§āύ period-āϤ āĻāĻā§ ?
(a) 2 (b) 3 (c) 4 (d) 5
Ans / āĻāϤā§āϤ⧰: (c) 4
Explanation: It is located in Period 4. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻ Period 4-āϤ āĻ
ā§ąāϏā§āĻĨāĻŋāϤāĨ¤
Q10. Scandium oxide formula is ? Scandium oxide-ā§° āϏā§āϤā§āϰ āĻāĻŋ ?
(a) ScO (b) ScâOâ (c) ScOâ (d) ScâOâ
Ans / āĻāϤā§āϤ⧰: (b) ScâOâ
Explanation: Sc shows +3 oxidation state. āĻŦā§āϝāĻžāĻā§āϝāĻž: Sc-ā§° oxidation state +3āĨ¤