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On the periodic table, this element with atomic number 79 has been treasured by civilizations for thousands of years.
Difficulty: Easy- Silver
- Platinum
- Gold
- Copper
Rapid cooling of austenitic steel below 200°C triggers this phase change that creates an extremely hard, needle-like microstructure.
Difficulty: Medium- Martensite formation
- Ferrite precipitation
- Bainite formation
- Pearlite formation
This element with symbol Cn was named after the astronomer who proposed the heliocentric model of the solar system.
Difficulty: Hard- Copernicium
- Curium
- Californium
- Cerium
This column of the periodic table contains highly reactive metals like sodium and potassium that explode on contact with moisture.
Difficulty: Medium- Alkaline earth metals
- Alkali metals
- Halogens
- Transition metals
This mechanism in dislocation theory describes how a segment bows out between pinning points to generate new dislocation loops under applied stress.
Difficulty: Hard- Frank-Read source
- Bardeen-Herring source
- Orowan loop
- Thompson tetrahedron
This element with atomic number 1 is the lightest and most abundant in the universe.
Difficulty: Easy- Hydrogen
- Helium
- Lithium
- Carbon
This spectroscopic method exploits the magnetic properties of atomic nuclei in a strong field to reveal molecular structure, commonly using ¹H and ¹³C.
Difficulty: Hard- Nuclear magnetic resonance spectroscopy
- Electron spin resonance spectroscopy
- X-ray photoelectron spectroscopy
- Mössbauer spectroscopy
Window glass becomes this way because its molecules lack the organized, repeating pattern found in crystals.
Difficulty: Easy- Ionic
- Amorphous
- Metallic
- Crystalline
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