Chromium||Discovery|Physical Properties|Important Ore|Oxidation state|Electronic Congratulation скачать в хорошем качестве

Chromium||Discovery|Physical Properties|Important Ore|Oxidation state|Electronic Congratulation

Chromium||Discovery|Physical Properties|Important Ore|Oxidation state|Electronic Congratulation #chromium #disciveryofchromium #physicalpropertiesofchromium #oresofchromium #electronicconfigurationofchromium #chemistrywallah #pashtolecture #xploretheworldofchemistry #physics #elements #tariqpathan #drhadi #chemsexercises #pashtiwala Chromium (Cr) 1) Discovery Louis Nicolas Vauquelin discovered chromium in 1797. He discovered it from the mineral crocoite (PbCrO₄). The name chromium comes from the Greek word “chroma” meaning color, because chromium compounds show many beautiful colors. 2) Physical Properties Atomic Number: 24 Atomic Mass: 52 Group: 6 (Transition metal) Period: 4 Color: Shiny, hard, silvery-gray metal Melting Point: 1907°C Boiling Point: 2671°C Density: 7.19 g/cm³ Very hard and corrosion-resistant Used in stainless steel and electroplating 3) Important Ore The most important ore of chromium is: Chromite (FeCr₂O₄) Other ores: Crocoite (PbCrO₄) Chromite is mainly found in countries like South Africa, Kazakhstan, and India. 4) Oxidation States Chromium shows variable oxidation states because it is a transition element. Common oxidation states: +2 (Chromous compounds) +3 (Most stable and common) +6 (Chromates and dichromates) Examples: CrCl₂ → +2 CrCl₃ → +3 K₂Cr₂O₇ → +6 5) Electronic Configuration Chromium has an exceptional electronic configuration. Expected: [Ar] 3d⁴ 4s² Actual (Correct): [Ar] 3d⁵ 4s¹ Reason: Half-filled 3d⁵ subshell is more stable. That is why one electron shifts from 4s to 3d. If you want, I can also provide: ✔ Chemical properties ✔ Uses of chromium ✔ Short exam questions ✔ Long detailed notes for 2nd year / FSc level Just tell me 😊