Brass: Cu + Zn. Bronze: Cu + Sn. Steel: Fe + C. Duralumin: Al + Cu + Mg + Mn. Brass is corrosion-resistant and used in plumbing, musical instruments. Zinc content varies (5-45%). Brass with higher zinc is stronger but less ductile. Some brasses contain small amounts of other elements.
Explanation:
Sodium and potassium are highly reactive alkali metals that react vigorously with oxygen and moisture in the air, potentially catching fire. To prevent accidental fires, they are stored immersed in kerosene oil. Magnesium and calcium do not require such extreme storage conditions.
Explanation:
Crystallization separates a pure solid from a solution by cooling or evaporating the solvent. Impurities remain in the mother liquor. Example: purifying copper sulfate. Distillation for liquids; filtration for insoluble solids.
Explanation:
Total electrons = 16 (Sulfur). Period = number of shells = 3. Valence electrons = 6, group = 10+6 = 16 (Group 16, chalcogens). Group 6 would be 6 valence electrons but in d-block, not applicable. Group 18 has 8 valence electrons (except He). So sulfur is in group 16, period 3.
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